1/10 Dr Chris and Dr Xand learn about gravity. (R)
2/10 Dr Chris and Dr Xand learn about meteorites and what happens when they land on Earth. (R)
3/10 Dr Maggie discovers some clever coral that can tell the time. (R)
4/10 Dr Chris and Dr Xand find out about the moon and how it affects our oceans and tides. (R)
