Allart Ligtenberg shows off a portable solar parabolic cooker he designed at his home in Los Altos, Calif. on Monday, March 11, 2013. Ligtenberg is a
Allart Ligtenberg shows off a portable solar parabolic cooker he designed at his home in Los Altos, Calif. on Monday, March 11, 2013. Ligtenberg is a retired HP engineer who is helping the world become a greener place by bringing simple solar technology to remote places like Nepal. (Gary Reyes/ Staff) ( Gary Reyes )