Solar Powered Lawn Mower Cuts the Grass So You Don’t Have To
 

It takes a lot of power and energy to keep grass levels down to an appropriate level; especially when it’s hot out. If cool glasses of lemonade aren’t around, the task at hand may not be completed any time soon causing the unkempt blades of green (or yellow) vegetation outside to continue their path of growth towards the sun.

http://hackaday.com/2014/08/01/solar...8Hack+a+Day%29