President Obama's voter-approval ratings certainly have been far from spectacular for much of his presidency, remaining mostly below 50 percent since November of 2009.
But on that dimension he may actually be doing better than it appears, at least based on some statistical modeling of presidential approval ratings conducted by George Washington University political scientist John Sides.
If you thought the presidential primaries were extraordinarily negative, now there's statistical evidence that you were right.
A new analysis of TV ads finds that 70 percent of the messages were negative — a trend spearheaded by the heavily financed superPACs supporting the candidates. At this point in the 2008 election, 91 percent of TV ads were positive.
A new study has some reassuring news about how fast Greenland's glaciers are melting away.
Greenland's glaciers hold enough water to raise sea level by 20 feet, and they are melting as the planet warms, so there's a lot at stake.
A few years ago, the Jakobshavn glacier in Greenland really caught people's attention. In short order, this slow-moving stream of ice suddenly doubled its speed. It started dumping a whole lot more ice into the Atlantic. Other glaciers also sped up.