Did a small experiment with my kid. Using Lemon to light up a LED.  Using 5c coins (copper) and Nails (zinc) as the cathode and anode. Single Lemon giving out 0.9V, insufficient to light up a LED that require 2.5V min. solution is to cut the lemon in 3, connect them up in series. 🙂

My passion lies with linux and settings things up to automate daily iT with open source. Particularly network management.
Would like to create virtualbox images containing various tools for easy deployment in environment to do network management.
Things like availability test with dependency test. Mac/IP address history for easy locating machines in network. Backup of network devices config. Redundant link monitoring and alerting. Routing paths.

This App uses camera of modern smart phone to provide visual feedback to kids learning phonics. much like a mirror.

One part of screen gives example and the other part showing a camera image of the kids face, providing positive feedback.