elusive little critters that tend to disappear moments after being spotted. Unless, it turns out, you trap them in a "magnetic bottle" and turn the temperature right down to almost absolute zero. CERN scientists have now used this technique to hold 300 antihydrogen particles for up to 1,000 seconds, relaxing them into their ground (stationary) state to make them easier to study. This opens the way for further research later in the year, when captured particles will be prodded with lasers and microwaves to see if they obey the same laws of physics that govern everything else in our universe. After all this effort, we're quietly hoping they don't.