Everything You Need To Know About Ricin, The Poison Mailed To President ObamaRicin is one of the most poisonous substances on Earth, its scarily easy to make, and somebody is mailing it to the President and at least one U.S. senator. What it is, how it works, and more, inside.By Dan Nosowitz

via Everything You Need To Know About Ricin, The Poison Mailed To President Obama | Popular Science.