Two things, totally unconnected..
1) Try this wepage for loads of fab science songs. You might regret it when you've got songs like 'what makes the lightning' stuck in your brain, but it's good for a giggle. You never know, you might learn something (but don't tell the kids it's educational).
2) We saw the first Spring frogspawn in our pond today. We'd had a heavy frost overnight so in the morning the frogspawn was frozen, but it seemed to have defrosted by mid day. I figure it'll survive ok, it usually does.
Do you think this is the reptile equivalent of frozen embryos..?