February 7th
1736 - Death of Stephen Gray, English astronomer
1870 - Birth of Alfred Adler, Austrian psychologist
1877 - Birth of Godfrey Harold Hardy, English mathematician
1889 - Birth of Harry Nyquist, important contributor to information theory
1897 - Death of Galileo Ferraris, Italian physicist
1905 - Birth of Ulf von Euler, Swedish physiologist and Nobel Prize Laureate
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I can't believe we still have to cover this. We know how old the Earth is. The science on this is pretty darn good. It is 4.54 billion years old plus or minus about 1%.