Scientists believe iron was first discovered in Egypt. Iron has been found in many ruins across the ages, ranging from as far apart as Mesopotamia and the western Roman Empire, but the oldest iron relics were found in Egypt and date from around the year 5000 BC.Know More
Scientists believe that the first iron worked by humans fell from the sky in the form of a meteorite. This is because iron tends to be found far beneath the surface, making the presence of iron uncommon until proper mining techniques were developed.
Most meteorites are made from stone or rock, but a small proportion are almost entirely iron, and they are known as iron meteorites.
Though iron artifacts have been found from around 7000 years ago, they are extremely rare because iron corrodes much faster than silver or gold, meaning the vast majority of iron relics are destroyed before they can ever be discovered.Learn more about Inventions
Many people think of paper as having its start in Egypt, but paper similar to what is used today was actually created in China. The invention is credited to Ts'ai Lin, who created his version of paper around 150 AD.Full Answer >
Penicillin was discovered by bacteriologist Sir Alexander Fleming in 1928. The accidental discovery occurred when he observed several mold spores had fallen on and destroyed bacteria in an open laboratory dish.Full Answer >
The discovery of gold as a specific, malleable metal probably took place along river banks of Africa and Eurasia but at different times. However, gold flakes have been discovered in Spanish caves dating to about 40,000 B.C. Whether these flakes were distinguished by Paleolithic humans or were incidental products of other activities is unknown.Full Answer >
Two Greek mathematicians pioneered research to navigate and map the Earth. Eratosthenes of Cyrene, chief librarian at the Ancient Library of Alexandria, calculated the circumference of the Earth in the third century B.C. In the second century B.C., Hipparchus of Nicea first used mathematics to calculate latitude and longitude, invented the first astrolabe to observe stars and measure latitude, and observed lunar eclipses to propose longitudes for specific cities.Full Answer >