Global Condemnation After Syria 'Chemical Attack'

At least 58 people were killed in the apparent chemical attack on Khan Sheikhoun in north-west Syria. The White House says it's "confident" the government of Bashar al-Assad was behind it.

Also in today's programme, the graphene-based sieve capable of removing salt from seawater. And fresh attempts to locate Caligula's pleasure boat.

(Photo: A Syrian child is treated in hospital after the apparent chemical attack. Credit: Mohamed al-Bakour / AFP / Getty Images)