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What's the difference between a newt and a salamander?Salamanders and newts are both long-tailed amphibians, but what's the difference between them?
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Do your dreams change as you age?A young child's dreams and an elderly hospice patient's dreams can be very different. What has research found about how our dreams change over time?
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Why do some cat siblings look so different?Normally, siblings resemble each other. So why does a litter of kittens often come in a variety of colors?
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Did Neanderthals have religious beliefs?Whether Neanderthals had religious beliefs is a subject of ongoing debate.
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Are free radicals really that bad for you?Free radicals are highly reactive molecules that are missing an electron. They get a bad rap, but could they actually have any benefits?
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How did metamorphosis evolve?While it might seem like an all-or-nothing process, insect metamorphosis likely emerged through gradual evolutionary changes.
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Were there female gladiators in ancient Rome?Rome is famous for its gladiators, but were any of these fighters women?
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What's the darkest place in the solar system? What about the universe?Space looks very dark from Earth. But does the solar system, and the universe for that matter, have an area that's the darkest of all?
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Why do European cities have milder winters than those in North America, despite being at the same latitude?London is at the same latitude as Calgary, Alberta. So why is the Canadian city about 15 degrees Fahrenheit (8.3 degrees Celsius) cooler in January?
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