Bananas have a curved shape because they reach for the sunlight when they grow. This unique process is known as ‘negative geotropism’. – WTF Fun Facts
Source: http://www.dole.eu/dole-earth/farmtour/bananito/hotspot/banana-curved.html
sunlight
WTF Animal Fact – White Goldfish
Goldfish will lose their color and turn white if they are kept in the dark and not exposed to any sunlight. – WTF Fun Facts
Source: https://pethelpful.com/fish-aquariums/Why-do-goldfish-change-color