Why are Cacti so Spiky?

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...
27 August 2010

Cactus1web.jpg

Many species of cactus have long, sharp spines.

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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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