Earth’s time bombs may have killed the dinosaurs – environment – 27 July 2011 – New Scientist

THE fate of the dinosaurs may have been sealed half a billion years before life even appeared, by two geological time bombs that still lurk near our planet’s core.

A controversial new hypothesis links massive eruptions of lava that coincided with many of Earth’s largest extinctions to two unusually hot blobs of mantle 2800 kilometres beneath the crust. The blobs formed just after the Earth itself, 4.5 billion years ago. If the hypothesis is correct, they have sporadically burst through the planet’s crust, creating enormous oceans of lava which poisoned the atmosphere and wiped out entire branches of the tree of life.

via Earth’s time bombs may have killed the dinosaurs – environment – 27 July 2011 – New Scientist.

Is It Just Your Imagination or Do All Radio Stations Play Ads at the Same Time? « Cheap Talk

Two radio stations compete for advertisers. They run ads during 10 minute slots that they can locate anywhere within a given hour of air time. They know that listeners don’t like ads and will switch to another station to avoid them. Will their commercial times be disjoint, overlapping or will they exactly coincide?

via Is It Just Your Imagination or Do All Radio Stations Play Ads at the Same Time? « Cheap Talk.