What's the brain thinking as it watches you jump around, swinging imaginary bats or head-butting imaginary soccer balls?

当大脑看到你在摄像头前蹦蹦跳跳，它是如何思考呢？——你是挥动球拍还是头顶足球？

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Paraguay's Roque Santa Cruz (right) and Japan's Yuki Abe jump for the ball during a World Cup second round soccer match at Loftus Versfeld stadium in Pretoria June 29, 2010.

巴拉圭的圣克鲁兹(右)和日本的阿部由纪球跳跃在世界杯第二轮在洛夫特斯versfeld在比勒陀利亚2010年6月29日体育场的足球比赛。相比看明星足球赛。

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Baby Soccer, Spider Walker, Frog Jump, Steeplechase... who is the winner?

宝贝足球，蝴蝶飞飞，爬行蜘蛛，跳跃青蛙，障碍赛……比比谁是小冠军？

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If you make the jump from soccer mom to official paid chauffeur, meaning you operate a car pool in order to make a profit, the rules are different.

FORBES: Taxes From A To Z (2013): C Is For Carpooling