In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
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Cuban rescue workers use sniffer rabbits to find people in collapsed buildings.
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In the Bemba tribe of southern Africa, if someone does something hurtful, they take the person to the center of the town where the entire tribe comes and surrounds them. For two days they tell him every good thing he has ever done, because they believe that every person comes into the world as good.
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