Bright yellow is a happy color representing the positive yellow qualities: joy, intelligence, brightness, energy, optimism, and happiness.

明亮的黄色是一种代表积极的快乐的颜色。黄色的特点：欢乐，智慧，明朗，能量，乐观和幸福。

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He also follows in the footsteps of Buzby, the animated yellow bird who urged Britons to "make someone happy" with a phone call in the late 1970s.

BBC: ET phones home again