On earth, humans cheer wildly when they see things they like. This could be anything from a man throwing a ball into a net, to a useful new operating system fea

On earth, humans cheer wildly when they see things they like. This could be anything from a man throwing a ball into a net, to a useful new operating system feature. It's considered a way to express approval, especially when gathered in a crowd, where shouting words would be less effective. See also: booing.