Ask the Naked Scientists, South Africa 14.09.05 - Why does spaghetti break into 3 pieces?

Summary: Can we rear people in a germ-free environment? Can you be born with only one kidney? Why does spaghetti always break into 3 pieces? What exactly is temperature? When you add more water to the bath and then pull the plug - what water goes down the drain first, the new or the old? Why do birds live longer than their size would suggest?