Top 10 scientific mysteries for the 21st century

Solving the toughest problems posed by nature is not just fun and games

Calabi-Yau manifold

Calabi-Yau manifolds like this one represent extra dimensions tightly curled and wound up so they can't be detected. The question of how many dimensions of space there actually are is one of the top scientific mysteries for 21st century scientists to solve.

Rogilbert/Wikimedia Commons

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