Science Podcasts

Ask the Naked Scientists episode

Fri, 27th Aug 2010

Why are Cacti so Spiky?

Many species of cactus have long, sharp spines (c) Jon Sullivan

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!

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