Astronaut Don Pettit demonstrates the Dzhanibekov effect aboard the ISS, where a spinning camera in microgravity unexpectedly flips its rotation axis by 180 degrees.
The bluestreak cleaner wrasse is a small fish that lives on coral reefs from East Africa to the Red Sea and all the way to French Polynesia. It eats tiny parasites and dead skin off bigger fish. Both sides benefit: the wrasse gets food and safety, and the bigger fish stay clean and healthy.
