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How many moons are in the solar system?The solar system has many more moons than the one we can see in the sky. But how many do we actually know about? And how many more are waiting to be discovered?
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Why do animals have different pupil shapes?Pupil shapes vary widely across the animal kingdom, from the W-shaped pupils of cuttlefish to the bar-like pupils of goats. But why are animal pupils shaped so differently?
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Why are humans the only species with a chin?Potential explanations abound, yet recent research has shed new light on the question.
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Will the Indus Valley script ever be deciphered?The Indus Valley script dates back around 4,000 years but has yet to be deciphered. Can AI help decode it?
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Can you see Earth's shadow?Earth's shadow follows the planet as it orbits the sun. You can get a sense of its enormous, awe-inspiring size by seeing this silhouette cast on objects ranging from satellites to the moon.
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Why aren't mammals as colorful as reptiles, birds or fish?Many mammals have fur the color of brown and black. Why don't they have more exotic colors, like purple and neon pink?
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Why is mercury a liquid?Mercury is a metal, yet it has some weird physical properties, including being a liquid at room temperature.
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When was the last time Antarctica was ice-free?Antarctica is covered by a miles-thick ice sheet, but was that always the case? And when was the coldest continent ice-free?
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Do you weigh more when an elevator goes up or when it comes down?Your weight doesn't change because of gravity but because the floor pushes back. Physicists explain why elevators briefly make you feel heavier or lighter.
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