Chemistry expert, Dr Kat Day, discusses the magnetic and powerful energy of Will Riker's Sex Beard with her chosen episode of Star Trek: The Next Generation - Season 7, Episode 12: The Pegasus. Does Riker's beard control his sense of ethics or transmit its sensuality? What colour are verterons? Where does all the plasma go? Find out in the twelfth episode of Will Riker's Sex Beard.