a printer that uses pencil. No more expensive ink, and its erasable!-This is so cool!
Frozen waves in Antarctica
A little paint/soap mixture goes a long way - for 9 cards (3 scratch-offs each), I suggest 2 tsp. paint/1 tsp. soap.
How To Make Your Phone Into a Projector - Thistlewood Farm
Simpliest Way to Make Chalkboard Labels | Damask Love Blog
Speakers that show the waveforms of the sounds produced. If that's not nerd perfect I don't know what is