If it's your son's science projec, shouldn't he be doing it?
A simple motor made by an spiral wire and a magnet.
It uses one AA battery.
In the Brevia section of the 9 August 2002 issue of Science, Weir et al. report a remarkable observation: The toolmaking behavior of New Caledonian crows. In the experiments, a captive female crow, confronted with a task t...