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If you are having trouble viewing this email with images below, click here. |  | |  | | | Viagra is one of the most well-known drugs in modern medicine. Nearly every adult in America has heard of the drug and can tell you what it does. Find out how this high-profile medication works its magic. | | | | | Groups of stars that form some sort of arrangement are known as constellations. See images of some of the most famous constellations that humans use to navigate, divine the future and tell stories. | | |  | | |  | | | Changing a tire can be tricky if you don't know what you're doing. How knowledgeable are you when it comes to changing a tire? Take this quiz and find out! | | | | | Fiery explosions, boiling lava, hot ash spewing everywhere -- total disaster is probably the first thing that comes to mind when you think "volcano." And, yes, that is certainly a possibility. But do you know what's really going on when a volcano erupts? | | |  | | |  | | | People donate their bodies to science all the time, usually after death. Here, we highlight 10 scientists who experimented on themselves while they were still alive. | | | | |  | | | At Discovery, we value your privacy. If you would like to adjust your email preferences, please click this link to our
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