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Joined over 2 years ago
Cedar Rapids, IA, USA
My name is David R. Sellers, and I'm an engineer. In my spare time, I like to create puzzles. Each logic puzzle requires you to think of objects from the past as well as the meaning of children's books and accept the fact that your child will find t...
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69 Followers
Joined over 10 years ago
Western University's Free Appropriate Sustainability Technology (FAST) Research Group
I am a professor that runs Western University's Free Appropriate Sustainability Technology (FAST) research Group Research group. I wrote the Open Source Lab: How to Build Your Own Hardware and Reduce Research Costs.
206 objects
727 Followers
Joined about 9 years ago
My basement in Oklahoma, US
I fail when I decide to stop learning.
34 objects
142 Followers
Joined about 4 years ago
Greece
Recreational Mathematics. Math Art.
Free