It's the end of the semester here at UC Berkeley, and I've got testing on my mind. I'm not the only one; across campus, instructors are engaged in the arduous task of grading quickly and fairly while students sigh with relief as they exit their final, final exams.
We most often think of tests as being about assessment. They tell us something about how successfully an individual has mastered the material being tested, and this assessment can in turn help us to assign grades, make determinations about placement or identify areas that would benefit from further study.
As the country awaits two important Supreme Court decisions involving state laws on same-sex marriage, a small but consistent body of research suggests that laws that ban gay marriage — or approve it — can affect the mental health of gay, lesbian and bisexual Americans.
Communications barriers have long vexed us, as showcased in the movie "Rush Hour."
(SOUNDBITE OF MOVIE, "RUSH HOUR")
CHRIS TUCKER: (As Carter) Do you understand the words that are coming out of my mouth?
LYDEN: Scientists in the 17th century were working hard to understand; mainly, the secrets of the universe but also, each other. With Latin on the decline, they were seeking a whole new way of communicating that would defy barriers and borders - a universal language.
If you're driving down the road someday and you come across a camper with a 50-foot periscope sticking up into the sky, you just might have crossed paths with Ira Leifer. His quirky vehicle is on a serious mission. It's sniffing the air for methane, a gas that contributes to global warming.
Leifer is an atmospheric scientist at the University of California, Santa Barbara. But you'll more often find him off campus, in a garage, next to a string of auto body shops near the airport.
From NPR News, this is ALL THINGS CONSIDERED. I'm Audie Cornish.
MELISSA BLOCK, HOST:
And I'm Melissa Block. Yesterday, President Obama sent out a tweet drawing attention to a study about climate change. The study found that scientists who say climate change is largely caused by human activities vastly outnumber the skeptics. NPR's Richard Harris has more on the study that caught the White House's attention.
Generations of physicists have claimed that time is an illusion. But not all agree. In his book Time Reborn: From the Crisis in Physics to the Future of the Universe, theoretical physicist Lee Smolin argues that time exists--and he says time is key to understanding the evolution of the universe.