Science news and highlights of the week.
About Gareth Mitchell
Before Gareth Mitchell joined BBC World Service he was a broadcast engineer. "The people who seemed to be having all the good fun were the creative types in the studios," and so he swapped engineering for presenting. In his spare time, he lectures in broadcast and written journalism at Imperial College in London.
About Bill Thompson
Technology writer Bill was born in Jarrow, grew up in Corby and went to Cambridge University. He still lives and works in Cambridge. Bill began to write for The Guardian in 1990 and in 1994 set up the paper's website. Two years later he became a freelance writer and has been writing and broadcasting ever since.