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If you are having trouble viewing this email with images below, click here. |  | |  | | | For more than 150 years, automotive engineers have been continually working on ways to improve the internal combustion engine. What are some of the biggest improvements they've made? | | | | | Let's say you're lost in the wilderness. Rather than guess which berries aren't poisonous, you down a rabbit. You're too famished for cooking. Should you eat it raw? | | |  | | |  | | | Sure, G.I. Joe's accoutrements are tiny, but this itty bitty gun actually fires rounds. What is it, and why is it illegal to import into the United States? | | | | | Expensive gemstones tend to disappear with unknown owners, resurface at auction years later -- and disappear again. So, it's pretty difficult to nail down values. But give it a shot: How much do you think these gemstones cost? | | |  | | |  | | | In physics, you can't get something for nothing, but superconductors offer hope of someday breaking even. Let's see how much you know about these wonders of electromagnetism. | | | | |  | | | 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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