As Gordon Brown visits Saudi Arabia, the Observer's political columnist Andrew Rawnsley writes, 'Green politics matter now more than ever. It is not woolly to be green at this time. It has never been more hard-headed.' His piece ends, 'Green is better than good. It is smart.'
We've seen particles that are massless only when moving one direction
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Inside a hunk of a material called a semimetal, scientists have uncovered
signatures of bizarre particles that sometimes move like they have no mass,
but a...
3 hours ago
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