Okay, but why?
From the library
browse all →Why is the sky blue?
Sunlight is a mixture of colors, and the atmosphere scatters short-wavelength blue much more than long-wavelength red.
Why is the universe expanding?
Space itself stretches, a momentum left by the Big Bang, now pushed faster by dark energy.
Why does bread rise?
Yeast eats sugar, burps invisible gas, and a stretchy gluten net traps it.