Why people yawn is a mystery. But yawning starts in the womb.
Past studies have used ultrasound images to show fetuses yawning, but some scientists have argued that real yawns were getting confused with fetuses simply opening their mouths.
So Nadja Reissland, a researcher at the University of Durham in the United Kingdom, used a more detailed ultrasound technique to get images of fetal faces that could distinguish a true yawn from just an open mouth.
An Israeli missile is launched from the Iron Dome defense system, designed to intercept incoming rockets. This missile was fired from the southern Israeli city of Ashdod in response to a rocket launched from the nearby Palestinian Gaza Strip on Nov. 18.
In the Gaza Strip fighting, where a cease-fire was reached Wednesday, the Israeli military pounded Gaza with hundreds of airstrikes. Hamas, the militant Palestinian group that rules Gaza, launched hundreds of rocket attacks on Israel.
The weeklong battle temporarily diverted attention from Iran, the archenemy of Israel and a key ally of Hamas. Israeli leaders have threatened to strike Iran over its nuclear program.
Yet the Gaza fight may offer insights into what a possible confrontation between Israel and Iran would look like.
Originally published on Fri November 30, 2012 12:50 pm
The election may be over, but the bickering continues, and not just between NPR's Ron Elving and Ken Rudin. As President Obama defends his United Nations ambassador, Republicans on Capitol Hill continue to lambast her for "misleading" reports about what happened in the aftermath of the attack on the U.S. Consulate in Benghazi, Libya. Plus: Mitt Romney's "gifts" that keep on giving. And Rep. Allen West concedes in Florida.