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Why does the moon look larger when it's on the horizon?The moon looks enormous when it's near the horizon — why is that?
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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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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 AI chatbots use so much energy?AI chatbots are infamous energy guzzlers. But why do they use so much electricity?
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What would space sound like if we could hear it?In space, no one can hear you scream — here's why.
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Why do diamonds come in different colors?The vast majority of polished diamonds are clear and sparkly, but some come in unexpected colors like blue, green and even pink. So why are some diamonds different colors?
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Does the color purple really exist?The color purple is, in a way, invented by our brains.
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What's the safest seat on a plane?Are some parts of an airplane safer than others?
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Do other planets have seasons?Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?
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Why do cats bring home dead animals?Cats sometimes catch and leave a "gift" for their humans. But why do cats give us dead mice, birds or other prey?
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Do black holes really evaporate — and how do we know?In 1974, Stephen Hawking proposed that black holes could evaporate. But do we understand how this might happen?
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What's the 'coastline paradox'?Coastlines are challenging to measure, but why?
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Do opposites really attract in relationships?When it comes to love, the adage is that opposites attract. But does that really hold?
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Why do you feel less hungry when it's hot out?We know that people in colder environments eat more calories. But why does our hunger abate in the heat?
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Why is there sometimes a green flash at sunset and sunrise?On a clear day, sometimes a green flash appears with the sun on the horizon just after sunset or before sunrise. But why does this happen?
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Why do earthquakes happen far away from plate boundaries?It's well known that earthquakes can rock fault-filled places like the U.S. West Coast. But why do earthquakes happen in the middle of tectonic plates?
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Why aren't all orbits circular?Why do some celestial bodies have tadpole or even horseshoe-like orbits?
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How do insects know which flowers have pollen?Flowers use a variety of strategies to inform pollinating insects about their pollen reserves, including color, smell and even electrical changes.
