Michael Farmer: my life as a meteorite hunter

An expert’s guide to meteorites Dr Alan Rubin of UCLA explains the origins of these extraterrestrial rocks, illustrated with examples offered online until 23 February	Collecting guide: impactites, impact glass and Libyan desert glass Impactities, such as Libyan desert glass and Moldavite, were formed millions of years ago when asteroids collided with Earth. Their value has recently begun to rocket, says specialist James Hyslop
How to collect fossil fish (and other creatures of the deep) From stingrays to sea lilies to shrimps, the fossils of underwater life forms are more common than their terrestrial counterparts	What I’ve learned: James Hyslop Christie’s head of Science and Natural History on the magic of meteorites, celestial globes and selling a T. rex