An experiment at CERN is asking members of the public to analyse particle tracks over the internet, in an attempt to help answer one of the weirder questions in modern physics: whether antimatter falls up. Although, for now, antigravity is confined to science fiction, antimatter is our best hope of finding an example in the real world. Difficult and expensive to study, physicists have yet to see how it responds to gravity. Some theories suggest antimatter will fall exactly like matter, and others indicate extra gravity -- like forces that would pull down on antimatter even harder, but antigravity is not ruled out.

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