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Today at around 10:50 CEST, the amount of data accumulated by Large Hadron Collider experiments ATLAS and CMS clicked over from 0.999 to 1 inverse femtobarn, signalling an important milestone in the experiments' quest for new physics. The number signifies a quantity physicists call integrated luminosity, which is a measure of the total number of collisions produced. One inverse femtobarn equates to around 70 million million (70 x 1012) collisions, and in 2010 it was the target set for the 2011 run.

Let's begin with the biggest news of the day: Groupon 's CEO makes 575 times what Steve Jobs makes as chief exec at Apple.