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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?
4 Commentsanimals -
Why is mercury a liquid?Mercury is a metal, yet it has some weird physical properties, including being a liquid at room temperature.
chemistry -
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?
antarctica -
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.
4 Commentsphysics-mathematics -
Did the Vikings reach Maine?An 11th-century Norse coin found in Maine raises the question of whether the Vikings landed there.
3 Commentsvikings -
How can deserts form next to oceans?Deserts are notoriously dry, so why do so many of them border oceans?
2 Commentsplanet-earth -
What is rigor mortis, and why does it happen?Bodies usually stiffen after death in a process known as rigor mortis. But why does this happen, and how long does it last?
6 Commentshealth -
How long do most planets last?Planets are born, and they can also "die." So what's the lifespan of a typical planet?
2 Commentsplanets -
What are ghost lineages, remnants of the past that still exist in our DNA today?Ghost lineages reveal themselves through ancient genes that still exist in living beings today.
3 Commentshuman-evolution
