When mathematics lecturer Christine Taylor asked her Math 51 students in class whether they prefer she write on chalkboards or project her lecture notes, the students were in lockstep: chalkboards are ...

Artists have paintbrushes and canvas, carpenters have hammers and wood; for mathematicians, the tools of the trade have long been a blackboard and a slender cylinder of chalk (preferably Hagoromo, the ...

This spring, an 80-year-old Japanese chalk company went out of business. Nobody, perhaps, was as sad to see the company go as mathematicians who had become obsessed with Hagoromo Fulltouch Chalk, the ...