The hum of hummingbirds is produced by differences in air pressure during the flapping of their wings. Also, the overall shape of the wing adds nuance to the sound.
A Scientific American article addresses a question already raised by SpaceX leader Elon Musk. We would live in a simulation driven by light and gravity.
Danni Büchner is invited to Sam Dylan's Halloween party. But the "Goodbye Germany" emigrant has no desire for many other party guests. And find clear words.