Why are Cacti so Spiky? - a podcast by Dr Chris Smith

On Ask the Naked Scientists this week, we find out how cacti can survive with very little water, and why they are so well endowed with spines! We answer your questions on asteroids, the size of the universe and the correct angle to leave the Earth. Plus, we test Dave's knowledge of anti-ageing cosmetics! Like this podcast? Please help us by supporting the Naked Scientists

Further episodes of Ask the Naked Scientists

Further podcasts by Dr Chris Smith

Website of Dr Chris Smith