Take a look at the video and try to find a sequence of moves that will take you back to zero.
It would be nice to have a strategy for disentangling any tangled ropes...
Look carefully at the video of a tangle and explain what's happening.
Can you tangle yourself up and reach any fraction?
An aluminium can contains 330 ml of cola. If the can's diameter is 6 cm what is the can's height?
A ribbon is nailed down with a small amount of slack. What is the largest cube that can pass under the ribbon ?
Your school has been left a million pounds in the will of an ex- pupil. What model of investment and spending would you use in order to ensure the best return on the money?
A fire-fighter needs to fill a bucket of water from the river and take it to a fire. What is the best point on the river bank for the fire-fighter to fill the bucket ?.
When is a knot invertible ?
A plastic funnel is used to pour liquids through narrow apertures. What shape funnel would use the least amount of plastic to manufacture for any specific volume ?