How Were the Egyptian Pyramids Built?

  • Engraving of the Pyramids of Giza
Engraving of the Pyramids of Giza
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Author Tony Dunnell

January 7, 2025

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Ancient Egypt was home to more than 100 pyramids, many of which still stand today. One of the oldest monumental pyramids in Egypt, the Step Pyramid of Djoser, was built sometime between 2667 BCE and 2648 BCE and began a period of pyramid construction lasting more than a thousand years. The most famous monuments are found at the Giza complex, home to the Great Pyramid, the Pyramid of Khafre, and the Pyramid of Menkaure, all built during the Fourth Dynasty around 2600 to 2500 BCE — the golden age of ancient Egypt.

The Egyptian pyramids stand as one of humanity’s most remarkable architectural achievements, and their incredible precision and massive scale have confounded researchers for centuries. Despite numerous theories and extensive archaeological research, the exact methods of their construction remain a subject of scholarly debate. How did ancient Egyptians erect pyramids using millions of massive blocks weighing as much as 2.5 tons each? And how, more specifically, did they move those blocks up the superstructure? 

To this day, there is no known historical or archaeological evidence that resolves the question definitively. While popular speculation often veers into fantastical explanations — yes, including aliens — serious historians and archaeologists have given much thought as to how these monumental structures might have been erected using the technological capabilities of the time. Here are three of the most likely construction theories. 

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The Herodotus Machine

The first historical account of the construction of the pyramids came from the ancient Greek historian Herodotus in the fifth century BCE. In his Histories, he wrote that the Great Pyramid took 20 years to build and demanded the labor of 100,000 people. Herodotus also wrote that after laying the stones for the base, workers “raised the remaining stones to their places by means of machines formed of short wooden planks. The first machine raised them from the ground to the top of the first step. On this there was another machine, which received the stone upon its arrival and conveyed it to the second step,” and so on. 

These “Herodotus Machines,” as they later became known, are speculated to have used a system of levers or ropes (or both) to lift blocks incrementally between levels of the pyramid. Egyptian priests told Herodotus about this system — but it’s important to note that this was a long time after the construction of the Great Pyramid, so neither the priests nor Herodotus were actual eyewitnesses to its construction. It is certainly feasible, however, that the machines he described may have been used, either by themselves or, more likely, in conjunction with other methods.

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What Did People Do Before Eyeglasses?

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Old spectacles on a book
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Author Timothy Ott

December 20, 2024

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Somewhere in the vicinity of Pisa, Italy, around 1286, an unknown craftsman fastened two glass lenses to a frame likely made of wood or bone to create the first eyeglasses.

With approximately two out of three adults in the United States today requiring some form of visual aid, it’s safe to say that invention has been well received. But even though 1286 is well before any of us first discovered the splendor of improved eyesight, it’s relatively recent in the larger picture of human existence. So how did people with subpar vision get by before there was a convenient LensCrafters to pop into?

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There’s not much historical evidence explaining how our prehistoric ancestors fared in the absence of visual aids, so we’re left to use some combination of deduction and common sense to determine how, say, a sight-impaired individual would keep up with the pack in a group of hunter-gatherers.

A person with imperfect vision could still be useful to a group simply because sharp eyesight to read signs, documents, and the like wasn’t necessary in prehistoric times. As civilization progressed, those with visual impairments could even find their condition produced certain advantages. A myopic (nearsighted) person, for example, could find themselves steered toward a craftsman role for their ability to focus on detail.

That said, humankind used visual aids for many centuries before the first eyeglasses appeared in the Middle Ages. Here are a few of the tools that helped those dealing with hyperopia (farsightedness) and other sight-related challenges.

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Early Lenses

Archaeological digs in the eastern Mediterranean area have uncovered the existence of plano-convex lenses (flat on one side and rounded on the other) made of glass and rock crystal that date back to the Bronze Age. The most well known example is the Nimrud lens, which was found in the remains of an Assyrian palace in modern-day Iraq. While it’s unknown what these lenses were used for, some of them magnify objects between seven and nine times, rendering them useful for work on items in close quarters. 

In his book Renaissance Vision From Spectacles to Telescopes, Vincent Ilardi suggests that the presence of holes or “resting points” on some of these lenses indicates they may have been propped up in a way that allowed artisans to use their hands. Additionally, he offers the discovery of a 5,300-year-old Egyptian ivory knife handle with carved microscopic figures as evidence that ancient Egyptians had a means for providing vision enhancements.

These weren’t the only civilizations to discover uses for lenses. A 2.3-gram convex crystal lens was found in the tomb of a son of Chinese Emperor Liu Xiu, who lived in the first century CE. Its creation was fostered by the optical studies published centuries earlier by Chinese scholars, including the philosopher Mozi and King Liú Ān.

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How and When Did People Start Making Glass?

  • Making a glass goblet, 1751
Making a glass goblet, 1751
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Author Kristina Wright

June 13, 2024

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The typical home contains dozens of items made of glass, from canning jars in the pantry to decorative knickknacks on the mantel to the windows and doors that insulate our living spaces and filter light. Despite the surge of plastic products following World War II, this delicate translucent material has maintained its essential place in our homes and daily routines.

Historically, the glass items that we now take for granted were highly coveted luxuries, accessible for a time only to the rich and royal. The evolution of glassmaking has transformed the material from an exclusive work of art to an ubiquitous aspect of modern living. But when — and how — did humans first learn to make this valuable, versatile material?

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What Is Glass Exactly?

To understand how glass is made, we must first understand what glass is and how it’s different from other materials. Rather than a single, uniform substance, glass is an unusual state of matter that looks like a solid but acts like a liquid. The formation of glass occurs when a molten substance is cooled so rapidly that its atoms are unable to organize into the latticelike crystalline structure characteristic of a solid. Likewise, these atoms also lack the ability to move randomly, as they would in a liquid. Because of the unusual properties of its atoms, glass is in a distinctly unique category of its own, neither fully solid nor fully liquid, referred to as a rigid liquid or an amorphous solid.

While we typically think of glass as a human invention, it also occurs naturally. Lightning strikes, meteorite impacts, volcanic eruptions, and even some sea creatures can produce natural glasses that are similar in composition to human-made glass. Natural glass is formed when silica-rich sand or rocks are heated to high temperatures and rapidly cooled. Examples include obsidian, created by the rapid cooling of volcanic lava; tektites and impactites, formed by the impact of meteorites; fulgurites, created by lightning striking sand; and even the siliceous (silica) skeletons produced by certain types of sea sponges and algae.

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How Did People Wake Up on Time Before Alarm Clocks?

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Man waking up to alarm
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Author Nicole Villeneuve

May 7, 2024

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Timekeeping technology has come a long way from ancient Egyptian sundials, and with it, so has the ability to wake up at whatever precise time might be needed for work, school, or appointments — even if we often ignore a ringing alarm in favor of snoozing for just 10 more minutes. While the demands of modern society are certainly more rigid than they once were, people have long had various reasons to keep a tight schedule, and at times they had to rely on more than just the crow of the rooster or the chirping of birds at dawn to make sure they were up to meet the day.

The most basic way people woke up before the invention of alarms was strictly biological in nature. Long before the advent of mechanical clocks or artificial light, people lived in harmony with the natural rhythms of day and night. Two biological processes dictate this natural sleep-wake cycle: homeostasis and circadian rhythms. Homeostasis governs our body’s drive for sleep, which increases the longer we’re awake and dissipates once we fall asleep, eventually signaling when it’s time to wake up. Circadian rhythms, meanwhile, control alertness and drowsiness throughout the day, influenced by light (more alert) and darkness (sleepy time). 

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This isn’t the only internal body process that served as a primal wake-up call before alarm clocks: Some people relied on their bladders. In biographer Stanley Vestal’s 1984 book about the life of 19th-century Lakota warrior White Bull, he noted, “Indian warriors could determine in advance their hour of rising by regulating the amount of water drunk before going to bed.” Of course, these bodily functions still exist as natural wake-up calls, but circadian rhythms often get disrupted by modern light sources such as screens, and given the strict nature of our 21st-century work schedules, one’s bladder might not be the most reliable alarm.

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5 Common Items From Colonial America You’ve Never Heard Of

  • Student with hornbook
Student with hornbook
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Author Kristina Wright

April 10, 2024

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Life in colonial America was undeniably challenging, and early settlers had to be resilient and resourceful in order to survive. Many of the items that colonists used in day-to-day life were either brought from Europe or based on tools they had used in their old lives. While some remnants of the colonial era, such as spinning wheels and quill pens, remain a part of our collective memory, many lesser-known items have faded into obscurity or been replaced by modern innovations. Here are five once-common objects you may not have heard of before, each of which served an important role in sustaining family life and building communities in colonial America.

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Hornbook

A simple, durable tablet used as a primer for children’s studies, the hornbook originated in England around 1450 and was a staple of early childhood education in colonial America. Hornbooks were crafted by affixing a single page of parchment or paper onto a paddle-shaped wooden board and covering it with a translucent protective sheet made from an animal’s horn. This was created by soaking the horn in cold water to separate the parts, then heating and pressing the needed part into a thin, clear layer. A fundamental lesson was printed on the paper, such as the alphabet in lowercase and capital letters, simple vowel-consonant combinations, Roman numerals, and religious texts. Hornbooks remained popular well into the era of mass-printed books because they were both sturdy and functional.

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What Did People Use Before Toothbrushes?

  • Women brush their teeth
Women brush their teeth
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Author Bennett Kleinman

April 3, 2024

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Since the fourth millennium BCE, when urban civilizations first appeared in ancient Mesopotamia, humans have strived to achieve proper dental hygiene. Yet the nylon-bristled toothbrush we use today didn’t come along until the 1930s. For the thousands of years in between, people relied on rudimentary tools that evolved with scientific knowledge and technological advancements over time. Some of the earliest toothbrush predecessors date as far back as 3500 BCE. Here’s a look at how people kept their teeth clean before the modern toothbrush.

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Chew Sticks and Toothpicks

Sometime around the year 3500 BCE, the ancient Babylonians (located near modern-day Iraq) created a tool known as a “chew stick.” This simple, handheld piece of wood is considered the earliest known direct predecessor to the toothbrushes we use today. Chew sticks were simple wooden twigs cut to approximately 5 or 6 inches long. One end of the stick was then softened in boiling liquid to help separate the fibers, creating an almost brushlike effect. Individuals would chew on these sticks to freshen their mouths, as the frayed fibers would slide between the teeth and help loosen debris. Many early Arab cultures used a specific shrub called Salvadora persica (also known as the “toothbrush tree”) to create their chew sticks, which they called miswak. The shrub was particularly aromatic in nature and thought to have a stronger mouth-freshening effect than other plants.

Around this same time, civilizations in Mesopotamia, Egypt, and elsewhere in the ancient world also used early versions of a toothpick to keep their teeth clean. These were often made of thin pieces of wood, though in later years, wealthy individuals began crafting toothpicks from brass and silver for added opulence and durability. In ancient Greece, toothpicks were known as karphos, roughly meaning “blade of straw,” suggesting the Greeks may have used coarse fibers such as straw in addition to wood.

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The Fascinating History of Las Vegas

  • Las Vegas, Nevada sign
Las Vegas, Nevada sign
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Author Mark DeJoy

March 14, 2024

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Since the middle of the 20th century, Las Vegas has been known as the capital of the American id. Gambling has long been at the center of its appeal, as nicknames such as “Sin City” and “Lost Wages” suggest. “What happens in Vegas stays in Vegas” is the city’s well-known slogan, while others have remarked, “Las Vegas is where losers come to win, and winners come to lose.” 

Rising up from the Nevada desert, the city’s built environment is so extravagant that it’s difficult to imagine a time when its spectacle did not exist, fully formed. Let’s go back and trace the origins of this uniquely American city.

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A Desert Oasis

Even though Las Vegas occupies a unique place in American culture, its metropolitan origin was sparked by the same thing that gave rise to many other U.S. cities: the development of the railroad. The area that includes present-day Nevada became a United States territory with the signing of the Treaty of Guadalupe Hidalgo in 1848, which ended the U.S. war with Mexico. Despite its location in the basin of the Mojave Desert, the site of what is now Las Vegas was a sort of oasis — a valley that included a water source in the form of artesian springs. 

The water source was the selling point for railroad magnate and U.S. Senator William Clark. In 1902, he bought 2,000 acres of land and water rights in order to create a waypoint for the San Pedro, Los Angeles & Salt Lake Railroad he incorporated to connect those cities. The railroad line through Nevada began construction in 1904, and the following year, Clark auctioned off parcels of his land, which was located east of the railroad tracks. 

Around the same time, civil engineer John T. McWilliams was attempting to build a township west of the railroad tracks. Though he was working with far less acreage than Clark — 80 acres to Clark’s 2,000 — the development provoked competition and intensified Clark’s efforts to build his township. Clark offered refunds on the $16 train fare to town in order to attract buyers. Newspaper advertisements promised, “Get into line early. Buy now, double your money in 60 days,” though accounts differ on which of the two were commissioning that ad. 

Ultimately, McWilliams couldn’t really compete. After all, Clark owned the water rights and far more land, and he had a major stake in the railroad. On September 5, 1905, a fire almost completely consumed McWilliams’ townsite, and ensured that the competition between the two was short-lived; development would be concentrated west of the railroad tracks. Clark formed the Las Vegas Land & Water Company with his partners, and vowed, “I will leave no stone unturned and spare myself no personal effort to do all that lies within my power to foster and encourage the growth and development of Las Vegas.”

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What 6 Major State Capitals Looked Like 100 Years Ago

  • Nashville street in 1933
Nashville street in 1933
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Author Mark DeJoy

February 14, 2024

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One hundred years is a long time in the life of a city. New technologies emerge and wane, people come and go, cultural factors ebb and flow. But not all cities change at the same rate; some stay comparatively similar to their older incarnations, while others become drastically different. Here’s a glimpse at what a few iconic state capitals looked like a century ago.

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Atlanta, Georgia

Atlanta was named after the Western and Atlantic Railroad, for which it was a terminus. In the early 20th century, the city was well established as a major railway hub, and the downtown was built around its first train station. Hotels were concentrated in an area near the station (called, fittingly, Hotel Row) in order to serve train travelers, and by the 1920s, masonry high-rises created the city’s skyline.

Like many cities during this period, Atlanta was beginning to expand its roads in order to accommodate increasing numbers of cars. In the 1920s, the city built three major viaducts to allow traffic to bypass the high number of railroad crossings. The Central Avenue, Pryor Street, and Spring Street (later renamed Ted Turner Drive) viaducts not only improved vehicle safety, but also led to development outside the city’s downtown core. 

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We Tried Writing With a Quill, and Here’s What We Learned

  • Writing with a quill pen
Writing with a quill pen
Kristina Wright
Author Kristina Wright

February 13, 2024

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The use of quill pens dates back to the sixth century CE, when the feathers of large birds — primarily geese, turkeys, swans, and even crows — replaced the reed pens that had been used previously. Though it’s an obsolete writing utensil today, the quill pen remains a symbol of education, literature, and artistic expression. Many important historical documents were written using quill and ink, from the Magna Carta to the Declaration of Independence, and white quills are still laid out every day the U.S. Supreme Court is in session. 

In pop culture, the Harry Potter series has helped generate interest in the old-fashioned writing instrument, and Taylor Swift, noting the influences of Charlotte Brontë and period films, has referred to some of her music as “Quill Pen Songs.” “If my lyrics sound like a letter written by Emily Dickinson’s great-grandmother while sewing a lace curtain, that’s me writing in the quill genre,” she explained at the Nashville Songwriter Awards in 2022.

So what is it actually like to write with the quill pens of yore? To answer that question, I turned to the internet for authentic supplies and expert advice, and set out scribbling. Here’s what I learned from the experience.

Photo credit: Kristina Wright

First, What Is a Quill?

A traditional quill pen consists of a feather that has been trimmed to around 9 inches long, had its shaft stripped of barbs, and had the inside and outside of the hollow barrel cleaned of membrane and wax. The quill is then dried, typically by curing it in sand, and the tip is shaped into a nib with a channel split (cut) to hold the ink.

The earliest fluid inks were carbon-based black inks that are believed to have originated in China around 2700 BCE. Iron gallotannate (iron gall) ink eventually replaced carbon and became the primary ink used with quill pens from the Middle Ages until the beginning of the 20th century. Iron gall ink is a permanent, deep purple-black or blue-black ink that darkens as it oxidizes, and is made from iron salts and gallotannic acids from organic sources (such as trees and vegetables). The Codex Sinaiticus, written in the fourth century CE and containing the earliest surviving manuscript of the Christian Bible, is one of the oldest known texts written with iron gall ink. 

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5 Facts About the Golden Age of Radio

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Tuning a radio
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Author Mark DeJoy

January 12, 2024

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It’s easy to take for granted today, but the emergence of broadcast radio was a seismic shift in early 20th-century culture. Born out of ship-to-shore wireless telegraph communication at the turn of the 20th century, broadcast radio represented an entirely new pastime by the time it began to mature in the 1920s. The golden age of radio was the period from the 1920s to the 1950s when the medium was at its absolute peak in both program variety and popularity. Radio grew massively during this era: In 1922, Variety reported that the number of radio sets in use had reached 1 million. By 1947, a C.E. Hooper survey estimated that 82% of Americans were radio listeners. 

In addition to the music, news, and sports programming that present-day listeners are familiar with, radio during this period included scripted dramas, action-adventure series such as The Lone Ranger, science fiction shows such as Flash Gordon, soap operas, comedies, and live reads of movie scripts. Major film stars including Orson Welles got their start in radio (Welles became a household name in the wake of the infamous panic sparked by his 1938 broadcast of The War of the Worlds), and correspondents such as Edward R. Murrow established the standard for broadcast journalism. President Franklin D. Roosevelt used the medium to regularly give informal talks, referred to as fireside chats, to Americans listening at home. But radio was also largely influenced by advertisers, who sometimes wielded control of programming right down to casting and the actual name of the program, resulting in some awkward-sounding show titles, such as The Fleischmann’s Yeast Hour. The golden age of radio was a combination of highbrow and lowbrow content, offering both enduring cultural touchstones and popular ephemera — much like the television that eclipsed it. Read on for five more facts from this influential era.

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