NPR News

Reporting in Science, researchers write that mouse stem cells can be transformed not only into egg cells--but into newborn pups. Sean Morrison, a stem cell expert at the University of Texas Southwestern, explains the stem cell's journey, and what it could mean for fertility and assisted reproduction.

In The Joy of X: A Guided Tour of Math, from One to Infinity, mathematician Steven Strogatz provides an entertaining refresher course in math, starting with the most elementary ideas, such as counting, and finishing with mind-bending theories of infinity--including the idea that some infinities can be bigger than others.

To become president and to be re-elected president takes much luck (among other factors, like money and political skill.) And President Obama appears to be one of the most fortunate presidents in recent memory with the release of the latest employment report.

Ryan Andresen spent 12 years as a Boy Scout. Now that he's 17 and about to graduate from high school, he completed the final requirement to receive the Eagle Scout award, which signifies the highest rank in the organization.

Except, according to his mother, Karen, when he submitted the paperwork, the scoutmaster for Troop 212 in the San Francisco Bay Area told him he could not give him the Eagle Scout honor because Andresen is gay.