Gravity test: Antimatter falls down, but where did it all go?

One of the great mysteries of physics has been solved: How does antimatter … fall?
It is not a question that keeps most people awake at night, but some physicists have been waiting for its answer for years.
Scientists at CERN, the world’s largest particle accelerator in Switzerland, announced Wednesday that a pathbreaking experiment had confirmed that antimatter falls down with gravity — just like everything else. But that only leaves scientists asking more questions about this curious material.

Al Jazeera’s Colin Baker explains.

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