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. More » History Inventions

Manufacturers make mirrors by coating a thin layer of metal onto glass. Once the coating dries, the manufacturer places a protective coating over it to prevent scratches or the wearing away of the coating. On most househ... More » Home & Garden Decor Interior Decorating

A concave mirror is spherical and curves like a spoon and the curved surface has an inner surface that acts as the reflecting surface. Convex mirrors have an outer surface as the reflecting surface. The properties and im... More » Science Physics
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In 1897, the pencil sharpener was invented by John Lee Love. He was issued a patent for it on Nov. 23, 1897. That style of pencil sharpener is still in use today in schools and offices around the world, according to Abou... More » History Inventions

Several products and procedures were invented in 1974. One example is the Post-It Note, which was created by American Arthur Fry. Since their invention, Post-It Notes have been sold in over 100 countries across the world... More » History Inventions

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An English chemist, named Joseph Priestly, was the first to artificially produce carbonated water in 1767. John Mervin Nooth improved upon Priestly's process around the same time. The invention of soda is attributed to t... More » History Inventions