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Is it safe to feed cats and dogs a vegetarian diet?Many people give up meat for ethical, health or environmental reasons. But is it OK to put a cat or a dog on a vegetarian or vegan diet?
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What are the most common elements in the human body?Here are the top four (and a bonus fifth) elements that make up the human body.
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What are the largest impact craters on Earth?What does it take for an asteroid to make a dent on Earth, and which known impact events have left the biggest craters?
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Do other viruses have as many variants as SARS-CoV-2?Is COVID-19's rapid evolution unusual, or do other viruses have as many variants as this coronavirus?
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Is Earth expanding or shrinking?Do scientists know if Earth is shrinking or expanding, and if this difference over time will threaten life on our planet?
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Why do we stick out our tongues when we're concentrating?Researchers have several ideas as to why people sometimes stick out their tongues when they're concentrating.
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What happens when a baby takes its first breath?Fetuses don't breathe oxygen in utero, so how do newly born babies figure it out?
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What is the fastest animal on Earth?The cheetah is often called the world's fastest animal. But is that true?
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How does DNA know which job to do in each cell?How does DNA know when to become active?
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Does everyone have an inner monologue?Does everyone have a monologue in their head?
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Why do nuts and grains go bad?Even if they don't get moldy, nuts and grains can go bad. Why is that?
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Why aren't peanuts, pecans and almonds real nuts?Brazil nuts and cashews are crunchy and small, so why aren't they nuts?
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Could we ever pull enough carbon out of the atmosphere to stop climate change?Can we harness natural and human-made carbon traps to help us slow climate change?
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Why did trilobites go extinct?What took out the trilobites, whose fossils are found all over the world?
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Why are galaxies different shapes?Some galaxies are swirling blue disks, others are red spheres or misshapen, clumpy messes or something in between. Why the different configurations?
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Could the Sahara ever be green again?The Sahara was once a grass and shrub-covered steppe. Could this ever happen again?
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Why is space a vacuum?The nothingness of space is hard to wrap our heads around.
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Why can't humans digest corn?Have you ever wondered why humans can't digest corn?
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Does UV light kill the new coronavirus?There are three main types of UV light, but only one can kill SARS-CoV-2.
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What color is the sunset on other planets?It depends on whether the planet's atmosphere is predominantly filled with gas or dust particles.
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Does charcoal toothpaste really whiten teeth?Activated charcoal can protect against some poisons, but can it help whiten your smile?
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What is a gene drive?Gene drives are a way to get around the laws of heredity.
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Why do people confess to crimes they didn't commit?People may falsely confess to a crime for any number of reasons, but it disproportionally happens to those who are young or disabled.
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What if Earth were a super-Earth?What would happen if our Earth were much larger than it is now?
