Tuesday, May 21, 2013

Extinction is a Rule?


Joey Arnold shared From Quarks to Quasars's photo.
April 29
Original Oatmeal
Understanding Evolution: What is Natural Selection?

“When it was introduced in the 1940s, penicillin was a miracle drug, especially effective at curing infections caused by the bacterium Staphylococcus aureus (“staph”). In 1941, the drug c.
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