According to Jefferson Lab and Chemistry Explained, it is not possible to tell exactly who discovered lead, however, it has been in use since before Roman times. According to Chemistry Explained, lead sulfide, PbS, is a ... More »

No one knows exactly where or when lead was discovered. What is known is that by Roman times, lead was being widely used, so scientists to believe it has been around for thousands of years. More »

No one knows how lead was discovered. It was known to the ancients and is mentioned in the Bible. Scientists believe that lead was discovered as a by-product of mining other metals, such as copper. More »

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Although no specific person has ever been credited with the invention of glass windows, the first known use of glass in windows was during the Roman Empire. This likely occurred in about 100 C.E. in Roman-occupied Alexan... More »

It is not exactly clear as to who invented crop rotation, though early crop rotation methods were mentioned in Roman literature and also during the Middle Ages. There are a number of different crop rotation plans, rangin... More »

Pliny, an ancient Roman historian, suggested that the first glass was created near Syria around 5000 B.C. While this may be true, the first archaeological evidence of man-made glass dates back to around 3500 B.C. in East... More »

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Cyrus McCormick is widely credited with inventing a mechanical reaper, a machine based on older Roman, British and American designs. His patent was a continuation of the work his father, Robert McCormick, started two dec... More »

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