EPISODE · Aug 26, 2010 · 25 MIN
Why are Cacti so Spiky?
from Ask the Naked Scientists · host 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
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