How many times has this happened to you: you go on a sales call and realize you forgot your calculator. Then comes the onslaught of mental math anxiety (MMA).

Say goodbye to MMA forever with this high-tech pen calculator. (Click the link to see a video of the pen in action.)

Okay, probably not the most practical invention ever, but still worth checking out.

Have a great weekend, everyone.

[Hat tip]: TechEBlog