Russian troops have seized and set fire to Ukraine's Zaporizhzhia nuclear power plant. Here's what that means in terms of radiation.
Quantum mechanics is the body of scientific laws that describe the wacky behavior of photons, electrons and the other particles that make up the universe.
A "meteor" dagger found in the tomb of King Tut may have been a gift from abroad, but not everyone agrees.
The coldest city in the world is in Siberia. Here's why it's so cold there.