My own weird idea I thought of about a year ago. Be interested to see the answers... A longish strong pole (about 2 metres) could theoretically save a life if someone used it when jumping from a cliff edge. It would be used just before they hit the ground to decelerate themseves more gently (think of them pointing it downwards, and sliding down the pole near the ground). Also assume a flat surface on the ground and that the person falling is from a steep drop (terminal velocity). How long would this pole need to be to prevent death? Would a strong carbon-fibre material be suitable for the pole?