Does she really think you're funny, or is she just being polite? Jon Feingersh/Getty/Getty Images/Blend Images RM hide caption

itoggle caption Jon Feingersh/Getty/Getty Images/Blend Images RM

Can you name the 10 emotions conveyed above? The first six are basic emotions. The last four are complex emotions that combine two of the basic ones. (Check at the bottom for the answers.) Courtesy of Aleix M. Martinez hide caption

itoggle caption Courtesy of Aleix M. Martinez

About 10 percent of Americans have chronic insomnia. iStockphoto hide caption

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The brain edits memories of the past, updating them with new information. Scientists say this may help us function better in the present. But don't throw those photos away. iStockphoto hide caption

itoggle caption iStockphoto