Why are Cacti so Spiky?
27 August 2010
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!
- Previous Crab Shell Bandages
- Next Is Our Solar System Strange?
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