Hacker News
- Tacit Project. Haptic Sonar For The Blind. http://grathio.com/2011/08/meet-the-tacit-project-its-sonar-for-the-blind/ 2 comments
- Rock Paper Scissors Playing Glove http://grathio.com/2010/03/rock-paper-scissors-training-glove.html 5 comments
- Unlock A Door With A Secret Knock http://grathio.com/2009/11/secret-knock-detecting-door-lock.html 20 comments
- This is going to make my hideout the coolest on the block. http://grathio.com/2009/11/secret-knock-detecting-door-lock.html 4 comments science