* There’s a good amount of stigma around calling in sick, but now that a new study confirms that stress makes PMS symptoms worse, taking a personal day because Aunt Flow’s on her way just got a whole lot more legit. [Vitamin G]

* In order to ward off all the damage you do to your pearly whites—whether it comes from drinking coffee, eating candy, or even taking the birth control pill—you’re a regular brusher, right? Well, that handy-dandy toothbrush dates back to 5,000 B.C! [HuffingtonPost]

* We’d love to look like Halle Berry or Christina Hendricks, but sadly, there’s not much resemblance. You can however find the celebrity whose skin most closely matches yours! Hey, gotta start somewhere! [Lemondrop]

* There are about 250 million people worldwide suffering from rare diseases. But most have no foundations, no fund-raisers, and no conclusive research. Is it time to start paying more attention? [Time]

* Sending a freshman off to college this fall? Arm them with healthy-eating ammunition with these 5 low-cal dorm snacks. [Fox News iMag]

* If you’d rather hit the trail any day than do another workout on the dreadmill, you need to know a few basic rules of outdoor running, including these 12 crucial safety tips. [That’s Fit Canada]

* Some foods are just meant to go together: ketchup and hamburgers, wine and cheese, spaghetti and meatballs. But others can actually cause scary side effects when paired up. Take this quiz to see if you know which food combinations are bad for your health. [FitSugar]

* We are trying to quit diet soda, we really are—and fast. But laying off the fizzy stuff is an even more pressing issue if you’ve got a bun in the oven—drinking diet soda while pregnant is linked to premature delivery!