Discoveries and Events 19th - 21st Century

1805 - John Dalton

Jul 20, 1805

Atomic Theory

The Times

Period: Jul 20, 1805 to Jul 20, 2014

1838 - Matthias Schleiden

Jul 20, 1838

Discovered that all plants are made of cells

1846 - William Morton

Jul 20, 1846

Discovery of Anesthesia

1869 - Dmitri Mendeleev

Jul 20, 1869

Periodic Table

1898 - J.J Thomson

Jul 20, 1898

Proposed the Plum Pudding model of the atom

1913 - Henry Moseley

Jul 20, 1913

Defined the atomic number

1924 - Edwin Hubble

Jul 20, 1924

Discovered that the milky way is one of many galaxies.

1927 - Georges Lemaitre

Jul 20, 1927

Theory of The Big Bang.

1932 - James Chadwick

Jul 20, 1932

Discovery of the Neutron.

1965 - Leonard Hayflick

Jul 20, 1965

Normal cells divide only a certain number of times: the Hayflick limit.

1997 - Roslin Institute

Jul 20, 1997

Dolly the Sheep was cloned.

2001

Jul 20, 2001

The first draft of the human genome is Completed

2006 - Shinya Yamanaka

Jul 20, 2006

Generates the first induced pluripotent stem cells.

2012

Jul 20, 2012

Photonic Molecules are discovered at MIT