The earliest known use of plaster dates back to around 9000 BCE, with evidence from the ancient site of Çatalhöyük in modern-day Turkey. Here, Neolithic inhabitants utilized plaster made from lime to coat the floors, walls, and even ceilings of their mud-brick houses. This early application of plaster represents a significant technological innovation, indicating a […]
Hourglasses, also known as sandglasses or sand timers, were first used in the 14th century, although it is unclear exactly when they were invented. The earliest written reference to an hourglass dates back to the early 14th century in Europe, but they may have been used earlier in other parts of the world. Hourglasses were
Starting in 1931 with the invention of the electron microscope, the nanoworld became visible to us. The nanoworld contains items as small in diameter as 1 micrometer (1 micron) to a diameter 1,000 times smaller, a diameter of 1 nanometer. The nanoworld includes the smallest single celled organisms, the smallest bacteria as well as viruses,
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With the invention of the microscope, humanity became aware of the microworld which is defined as 1 to 1000 microns. A micron is equal to one thousands of a millimeter. A cell is about 10 microns wide. Paper is about 100 microns thick. The unaided human eye can see items as small as 50 microns,
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The earliest known magnification dates back to the first century. These simple early magnification devices consisted of using natural crystals or a glass globe filled with water. It is reasonable to assume the use of natural crystals for magnification was around for many thousands of years. One possible specimen is the Nimrud lens dating back
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14,000 Generations Ago Homo heidelbergensis: Long spears made hunting large animals more safe. The oldest wooden spears found so far were found in Germany and dates to circa 400,000 BCE. In fact, they are currently the oldest known wooden artifacts. The find included 3 wooden spears, stone tools, and the butchered remains of more than
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70,400 Generations Ago (from 2020 CE) By about 1.76 million BCE, early humans began to create hand axes. They would strike really large flakes, then continue to shape them around the edges. The hand axe pictured dates to circa 1.1 million BCE. It was found at Isampur, India.
The earliest known stone tools date back to at least 2.6 million years ago. These basic stone tools were made and used by early humans–hominids. Did they also use wood tools? Sure, or at least very likely, but we have yet to find any preserved back as far as stone tools which hold up to
31,600 Generations Ago Burned flint tools dated to circa 790,000 BCE were discovered at Gesher Benot Ya’aquov, Israel. Control of fire is one of the key traits of the genus Homo.
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Explore insights into science, philosophy, and history. This community features the writings of Mike Prestwood, a natural philosopher. This throwback title signifies his dedication to weaving together science, philosophy, and history. Engage in insightful discussions in a moderated, safe space where the realms of the irrational and unknowable are respectfully acknowledged but left at the doorway. Ready to connect with like-minded thinkers?
