>When computers go wrong, we tend to assume it's just some software hiccup, a bit of bad programming. But ionising radiation, including rays of protons blasted towards us by the sun, can also be the cause. These incidents, called single-event upsets, are rare and it can be impossible to be sure that cosmic rays were involved in a specific malfunction because they leave no trace behind them.

>And yet they have been singled out as the possible culprits behind numerous extraordinary cases of computer failure. From a vote-counting machine that added thousands of non-existent votes to a candidate's tally, to a commercial airliner that suddenly dropped hundreds of feet mid-flight, injuring dozens of passengers.

>As human society only becomes more dependent on digital technology, it's worth asking how big a risk cosmic rays pose to our way of life. Not least because, with the continuing miniaturisation of microchip technology, the charge required to corrupt data is getting smaller all the time, meaning it is actually getting easier for cosmic rays to have this effect.