physics
Why Is the Sky Blue? The Science Explained
It is one of the first questions children ask and one of the hardest for adults to answer. The blue sky comes down to a bit of physics about light, air, and the size of a wave. Here is why the sky is blue, and why sunsets are red.
What Is Quantum Entanglement, and Why Is It Strange?
Two particles can be linked so tightly that measuring one instantly tells you about the other, even across the galaxy. Einstein hated the idea and called it spooky. He turned out to be wrong. Here is what entanglement really is.