Every Boy Scout or Girl Guide probably had the experience of building a simple solar oven: an insulated box, some aluminum foil, and plastic wrap, and voila! On warm, sunny, summer days, you can bake.

On one ordinary day back in 2012, a hefty envelope turned up in my snail mail containing a very kind letter along with a mechanical drawing so detailed it made me want to chew my hair. The sender ...

Which solar ovens are best? Campfires, charcoal grills, and gas-powered camping stoves can definitely make life easier for hungry campers, but they can’t do everything. Sometimes, the only source of ...