Pencils were invented in 1795 by a French scientist named Nicolas-Jacques Conte. He used a mixture of graphite, clay and water baked in a kiln to create the "lead" of the pencil. He then housed this mixture in a wooden frame for writing.Know More
Conte created several different kinds of pencils depending on their intended use. He made round pencils for artists who would be drawing for long periods of time and needed comfort. He made square or polygonal pencils for draftsmen or carpenters so that the pencils would not roll away.
Despite the fact that the center of a pencil has long been referred to as "lead," pencils were never made of lead. They have always been composed of graphite. The misnomer came about when graphite was first discovered in the 15th century and mistaken for a form of lead.Learn more in Inventions
Items invented in 1998 include Windows 98, the iMac computer and the MP3 player. Viagra was also approved for use by the United States Food and Drug Administration in 1998.Full Answer >
Modern ice hockey rules were created by Canadian athlete, journalist and lawyer James George Aylwin Creighton. The first game of modern ice hockey was played in 1875 in Montreal, Canada. Ice hockey likely evolved from field hockey played in Northern Europe.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 >
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 >