Seven days, lots of science in the news. Here’s our roundup of some of the week’s most notable and quotable items.

Peacocks have their tails. Male lions have their manes. And now, new research suggests, male stegosaurs may have distinguished themselves—and signaled their prowess to the ladies—with rounder back plates. Because of the nature of fossils, it’s often hard to tell whether anatomical differences in dinosaurs are truly due to sex differences. But in a study published in the journal PLOS ONE, University of Bristol researcher Evan Saitta seems to have found convincing evidence that the shape of back plates may have been an important sex marker for these Jurassic titans.

Environmental journalist Cynthia Barnett’s new book, Rain: A Natural and Cultural History, examines not only how rain has worked as a driving force of human civilization, but also how we continue to have a contentious yet dynamic relationship with the natural phenomenon. Barnett waxes poetic about everything from the joy of rain in the very beginning of Earth’s existence to the way we ourselves have evolved for the rain. We spoke with her on a cloudy day about California’s rain problem, cloud seeding, the creation of the modern raincoat, and the scent of rain.

Your dog looks guilty and sorry, but is she? And what’s going on with other puppy dog looks? Shaming on the Internet keeps getting more and more creative, and its targets more diverse. Witness the hangdogs of the website dogshaming.com who bear placards outlining their offenses ranging from “I ate Josh’s underpants. I feel no remorse!” to “I get soooo excited when we have company over that I hump the cat!” In a majority of the doggie mug shots, the pooch looks up at the camera or slightly off to the side as if wordlessly apologizing to their aggrieved owners.

Seven days, lots of science in the news. Here’s our roundup of some of the week’s most notable and quotable items. Humans evolved pointier chins than other animals as our faces got smaller—not as a way to cope with the strain of chewing, a new study claims. This year’s Time 100 includes five influential women doctors and scientists. A gray whale named Varvara just set the record for longest mammal migration, at 14,000 miles, from Russia to Baja California. Scientists released a new map of dark matter in the universe or, rather, 0.4 percent of what we can see of the universe. SpaceX successfully delivered supplies to the International Space Station this week via a Falcon 9 rocket and a Dragon capsule, and Italian astronaut Samantha Cristoforetti successfully grabbed the cargo with the space station’s robotic arm. Among the deliveries is a special ISSpresso maker. A second attempt to land the first stage rocket booster on a ship in the Atlantic again came close to making it. The sound of your knuckle cracking comes from a bubble forming in the fluid of the finger joint—not from the bubble popping, as previously thought. Ocean waves are the culprit behind Earth’s mysterious vibrations. Winds blowing …