Why don't umbilical cords become tangled?
Given that a foetus is essentially a swimming thing on the end of a piece of string, how is it that the two don't become tangled more often? Find out in this jelly-like QotW. Plus, we ask what would happen if two black holes met.
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I'm a graduate student in the US, and really enjoy your podcast. As I'm 7 months pregnant, I have a question about the umbilical cord. How is it that it doesn't become tangled? Any other long cord (dog leash, ipod headphones, etc.) quickly loops into knots and kinks tha...