@penpln Twitter is great for conferences because someone will wish me good morning at 8:30 at night #nctm12 #mathchat
In reply to https://twitter.com/i/status/195669510898974720
@penpln Twitter is great for conferences because someone will wish me good morning at 8:30 at night #nctm12 #mathchat
By Greg McVerry · Permalink · Original tweet
