hide announcement WIN your very own meteorite! Subscribe, gift or renew a subscription to Cosmos and automatically go into the draw – Shop now!

The bad science of medical cannabis

Also in this issue: Understanding autism – Plate tectonics and early life – The current state of the search for dark matter – The future of space exploration

Closing in on dark matter

Dogged physicists are methodically sweeping through all the places where the elusive particles may be hiding. Cathal O’Connell checks their progress.