Most asteroids are made of rock, while comets can be a mixture of rock, organic molecules and frozen gases.

BBC: Asteroid impact centre site selected

"The guess is that both the water and the dark material, which we think is organic-rich material, were delivered by the same objects impacting Mercury: some mixture of comets and the kinds of asteroids that are rich in organic and volatile material like water ice, " Prof Solomon said.

BBC: Mercury's water ice at north pole finally proven

Was his mixture of romanticism and classicism genuine and organic or merely mechanical, a matter of putting themes doggedly through their paces?

ECONOMIST: How Brahms saved music from Wagner

Ford's new solution captures the volatile organic compounds from paint waste and concentrates them into a rich mixture of hydrocarbons.

FORBES: Paint Power