Penthusiasm is our way of sharing some of the great blog posts that we have come across that we believe may be of interest to our readers.
A couple of months ago, I wrote about teachers and students using green ink as part of a feedback system that focuses on improving work, instead of just highlighting mistakes.
That made me a little curious about green pens, since I didn’t really have much experience with them. The few I’d used were pretty unimpressive, mostly because the ink was so pallid. So I decided to take a run through a bunch of green pens to find the ones that worked the best. [Read more…]
Penthusiasm is our way of sharing some of the great blog posts that we have come across that we believe may be of interest to our readers. [Read more…]
This was a bit surprising: A YouTube video in which an engineering professor explains how a retractable pen works became a bit of a viral hit.
The simple 4:43 video from Bill Hammack – “engineerguy” on YouTube – had been viewed more than 370K times when I last checked, about a month after it was posted.
In the video, Hammack uses a Parker Jotter and some 3D modeling graphics to describe the interplay between plunger, cam, and spring that extends and retracts the ink cartridge and produces that distinctive clicking noise. [Read more…]