On 10 September last year, protons - tiny particles ordinarily found deep inside atoms - completed their first lap around the inside of the Large Hadron Collider, the new particle accelerator near Geneva. Revved up to enormous speeds by supercooled magnets, the protons raced around the LHC's huge ring, 27 kilometres in circumference. They criss-crossed the French-Swiss border more than ten thousand times a second before smashing into each other, releasing primordial fireworks.

LRB 17 December 2009 | PDF Download