The BBC article that's further down the front page at the moment brings it down closer to my level: http://www.bbc.co.uk/news/science-environment-11773791 http

The BBC article that's further down the front page at the moment brings it down closer to my level: http://www.bbc.co.uk/news/science-environment-11773791 http://www.bbc.co.uk/news/science-environment-11773791 ---- "Atoms are neutral - they have no net charge - but they have a little magnetic character," explained Jeff Hangst of Aarhus University in Denmark, one of the collaborators on the Alpha antihydrogen trapping project. "You can think of them as small compass needles, so they can be deflected using magnetic fields. We build a strong 'magnetic bottle' around where we produce the antihydrogen and, if they're not moving too quickly, they are trapped," he told BBC News. Such sculpted magnetic fields that make up the magnetic bottle are not particularly strong, so the trick was to make antihydrogen atoms that didn't have much energy - that is, they were slow-moving. ---- So, basically, magic. I'm just curious what the specific limitation is (but realize it may not be trivial to explain without understanding the entire containment process better).