One of the most prolific and interesting math bloggers and Twitters, John D. Cook (his blog is The Endeavor and he is @JohnDCook on Twitter) has been using Twitter in a very interesting way. In addition to his personal account, he has set up more than half a dozen daily Twitter messages on a variety of…
Tag: Twitter
Interesting approximations using trigonometry
Today on Twitter John D. Cook, writing as @AlgebraFact, posted the following tweet: In radians, sin(11) is very nearly -1. (It happens to be -0.9999902…) I thought that was awesome! So, I (@divbyzero) replied that cos(333) is approximately 1. (It is 0.999961…) Then @michiexile chimed in, pointing out that cos(355) is closer to -1 than…
Twitter and Origami
Twitter is amazing. Two nights ago I watched the PBS documentary on origami, Between the Folds. Yesterday morning when I got to my office I made the following post on Twitter: In the next 12 hours I was flooded with suggestions, comments, and links. Here are some of the book titles and links that people sent…
Twittering Division by Zero
I’ve been on Twitter for a few months, posting unimportant details about my life. But I’ve decided to repurpose that service and make it another outlet for my Division by Zero blog. In case you are not aware, Twitter is a micro-blogging service that allows you to publish posts (“tweets”) of up to 140 characters at…
Phone number fail
Our college has an (expensive) automated alert system. If there is an emergency on campus, then this system will broadcast news and warnings to all members of the campus community via telephone, cell phone, text messaging, email, etc. (I don’t think they’re set up for Twitter yet.) They sent one of these alerts today because…
David Richeson: Division by Zero 