Most of the time I'm typing, but definitely yes! I mean, just ask these guys! http://www.pri.org/stories/2015-06-29/mathematicians-mourn-loss-their-dream-chalk

Most of the time I'm typing, but definitely yes! I mean, just ask these guys! http://www.pri.org/stories/2015-06-29/mathematicians-mourn-loss-their-dream-chalk http://www.pri.org/stories/2015-06-29/mathematicians-mourn-l...