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Unlike ordinary light microscopes, the electron microscope provided scientists with the ability to directly visualize viruses for the first time

Nicotine stimulates receptors in the brain that release dopamine, creating a temporary sense of alertness or relaxation, depending on the user

Yet Tobacco mosaic virus has been an extraordinary tool in the past century, for research ranging from structural biology to host-plant resistance

In addition, Congress must reject pending proposals that would weaken FDA oversight of tobacco products and cut funding for the Centers for Disease Control and Preventions critical tobacco prevention and cessation programs

PICTURES: ATF "Gunwalking" scandal timeline In Fast and Furious, ATF secretly encouraged gun dealers to sell to suspected traffickers for Mexican drug cartels to go after the "big fish." But ATF whistleblowers told CBS News and Congress it was a dangerous practice called "gunwalking," and it put thousands of weapons on the street