Can you picture how to order the cards to reproduce Charlie's card trick for yourself?
A train building game for two players. Can you be the one to complete the train?
By proving these particular identities, prove the existence of general cases.
See how the motion of the simple pendulum is not-so-simple after all.
Why MUST these statistical statements probably be at least a little bit wrong?
Two cannons are fired at one another and the cannonballs collide... what can you deduce?
Given the mean and standard deviation of a set of marks, what is the greatest number of candidates who could have scored 100%?
Can you make a regular hexagon from yellow triangles the same size as a regular hexagon made from green triangles ?
