The world's largest particle smasher - the Large Hadron Collider at CERN, near Geneva in Switzerland - has seen the highest temperatures ever produced by a science experiment, thanks to a flurry of "mini big bangs".
On 7 November, the LHC started smashing lead ions head-on, instead of the usual proton-proton collisions. This produced what are referred to as mini big bangs: dense fireballs that have temperatures of about 10 trillion °C.
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