How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon.

When you hop, run or jump, your legs behave like springs, absorbing and returning energy with each step. But what happens to ...

Now, more than 122 years after it was first proposed, Kamata and two other mathematicians have finally proved that a solution with fewer pieces is impossible. Their result was posted to the server ...

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