North Korea Prepared To 'Go Nuclear'

North Korea's vice-foreign minister, Han Song Ryol, told the BBC that his country would carry out a pre-emptive nuclear strike if it saw signs that the United States was preparing to launch an attack.

American scientist, Lisa Feldman Barrett, tells us how emotions are made inside our brains.

We also look at what can be done to tackle neglected tropical diseases like river blindness, guinea-worm and trachoma.