Studies of ash captured from the air show that for every one of the largest particles (about 300 microns) there are a million or more with a size of only around two microns.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The

The answer to that puzzle will require considering different ways in which these particles and others decay into yet more particles from the zoo that may finally show enough CP violation to close the antimatter question.

BBC: Antimatter results emerge at LHC - but puzzle abides