New type of particle accelerator fired up for first time

A new type of particle accelerator designed as a proof of concept has reached a major milestone, successfully delivering a speed of 18 MeV.

Twitter eclipses 20 billion tweets

A Japanese man posted an innocuous tweet over the weekend, which translators have had difficulty understanding, but regardless what the message actually said there is no question as to its significance - it is the 20 billionth posting in the short history of Twitter.