The modern mirror was invented in 1835 by German chemist Justus von Liebig. However, people have been using various polished stones and metals as mirrors for at least 8,000 years.Know More
In a LiveScience article, Dr. Jay Enoch reviewed the evidence and determined that people in what is now Turkey used polished obsidian as mirrors about 8,000 years ago. Other variations of metals and polished materials served as early mirrors throughout the world. Polished copper was popular in Iraq and Egypt, while early South Americans used polished stones. Other cultures, including societies in India, used bronze.
Glass mirrors did not become popular until the 19th century, when Justus von Liebig applied silver to one side of a pane of glass and created the modern mirror.Learn more about Inventions
No single person invented algebra. The roots of algebra extend to the ancient Babylonians, who first developed mathematical techniques to solve problems using algorithms. Later work by Greek, Persian and Indian mathematicians further extended these techniques and laid the foundations for modern algebra.Full Answer >
Brahmagupta, a Hindu mathematician and astronomer, first used a dot underneath other numbers to represent the number zero in 628 A.D. He was the first to develop additive and subtractive operations that use zero.Full Answer >
The biggest inventions of 1994 were the CMOS image sensor and the first PlayStation games console. Other major inventions were the quantum cascade laser, the HIV protease inhibitor and the Segway.Full Answer >
Yogurt has been part of the human diet since around 6000 to 5000 B.C and was first made in Central Asia. Yogurt sold in its frozen form was invented in the early 1970s by a dairy operator from New England named H.P. Hood.Full Answer >