“Some call it the Rolls Royce of chalk, the Steinway of writing utensils. Some say it’s unbreakable, others say it leaves no dust behind. And it turned the world’s brightest minds into hoarders, going to great lengths just for a few sticks of the stuff.” How a brand of chalk achieved cult status among mathematicians.

+ Notorious B.I.G.’s crown up sale at Sotheby’s first hip hop auction.

+ The Dirtiest Hot 100 No. 1s of All Time Before WAP.