Some mathematicians have jokingly called it “a tragedy for mathematics.” It’s definitely a (co)sign of the times. This spring, a chalk outline was drawn around the Japanese company that made Hagoromo Fulltouch Chalk. With Hagoromo out of business, mathematicians have been hoarding its famous product.

+ Understanding the differences between ice cream and gelato.

+ If you have to be a subject in an animal testing program, this is the division into which you want to be recruited. From NatGeo: Do animals laugh? Tickle experiments suggest they do.

+ And from FastCo: Surfers’ Rectums Offer A Promising New Venue For Antibiotic Resistance Research.