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What is the smallest number of jumps needed before the white rabbits and the grey rabbits can continue along their path?

A right circular cone is filled with liquid to a depth of half its vertical height. The cone is inverted. How high up the vertical height of the cone will the liquid rise?

Can you describe what happens in this film?

How many triangles have all three angles perfect squares (in degrees)?

Can all but one square of an 8 by 8 Chessboard be covered by Trominoes?

Weekly Problem 20 - 2010
You have already used Magic Squares, now meet a Magic Octahedron...

Invent shapes with different numbers of stable and unstable equilibrium points

Weekly Problem 31 - 2016
The diagram shows a grid of $16$ identical equilateral triangles. How many rhombuses are there made up of two adjacent small triangles?

Emily's journey home took 25% longer than usual. By what percentage was her average speed reduced?