A standard 8×8 chessboard can easily be covered (tiled) with non-overlapping dominoes (1×2 pieces): simply use 4 dominoes in each...

Continue reading...# bicycle

## Pizza Slices

Take a pizza and pick an arbitrary point in it. Suppose you cut the pizza into 8 slices by cutting...

Continue reading...## Bike with Square Wheels

Ride a bike with round wheels and it rolls smoothly on a flat road (i.e., the axle remains level). Can...

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