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190,001 BCE
primtive period
a thunderbolt kick a earth and turn on fire, the humans see the fire.since then, the humans use the fire to cold ours,scary the animals and cold the foood -
1200 BCE
Iron Age
The extraction of iron from its ore into a workable metal is much more difficult than copper or tin. It appears to have been invented by the Hittites in about 1200 BC, beginning the Iron Age. The secret of extracting and working iron was a key factor in the success of the Philistines.[4][8] -
Robert Boyle
Anglo-Irish chemist Robert Boyle (1627–1691) is considered to have refined the modern scientific method for alchemy and to have separated chemistry further from alchemy.[37] Although his research clearly has its roots in the alchemical tradition, Boyle is largely regarded today as the first modern chemist, and therefore one of the founders of modern chemistry, and one of the pioneers of modern experimental scientific method -
Medieval alchemy
The elemental system used in Medieval alchemy was developed primarily by the Arabian alchemist Jābir ibn Hayyān and rooted in the classical elements of Greek tradition. -
19th century
In 1803, English meteorologist and chemist John Dalton proposed Dalton's law, which describes the relationship between the components in a mixture of gases and the relative pressure each contributes to that of the overall mixture.[57] Discovered in 1801, this concept is also known as Dalton's law of partial pressures. -
JHON Dalton
John Dalton is remembered for his work on partial pressures in gases, color blindness, and atomic theory -
Jöns Jacob Berzelius
A Swedish chemist and disciple of Dalton, Jöns Jacob Berzelius embarked on a systematic program to try to make accurate and precise quantitative measurements and insure the purity of chemicals. Along Lavoisier, Boyle, and Dalton, Berzelius is known as the father of modern chemistry. -
20th century
In 1903, Mikhail Tsvet invented chromatography, an important analytic technique. In 1904, Hantaro Nagaoka proposed an early nuclear model of the atom, where electrons orbit a dense massive nucleus. -
Albert Einstein
In 1905, Albert Einstein explained Brownian motion in a way that definitively proved atomic theory. Leo Baekeland invented bakelite, one of the first commercially successful plastics. -
biochemestry
Gerty Cori and Carl Cori jointly won the Nobel Prize in 1947 for their discovery of the Cori cycle at RPMI.
