Why the World’s Best Mathematicians Are Hoarding Chalk - YouTubeOnce upon a time, not long ago, the math world fell in love ... with a chalk. But not just any chalk! This was Hagoromo: a Japanese brand so smooth, so perfect that some wondered if it was made from the tears of angels. Pencils down, please, as we tell the tale of a writing implement so irreplaceable, professors stockpiled it. Got a story idea for us? Shoot us an email at pitch [at] GreatBigStory
