What's this book from my childhood (early 80s)? I believe it came from one of the book clubs (Arrow?), it was a Young Adult book about a boy who is friends with a scientist/inventor who has invented a death ray which he then has some opportunity to use... [more inside]
posted by Caviar on Nov 26, 2007 - 17 answers

Bendable six foot mirror into parabolic sunlight reflector. [more inside]
posted by UnclePlayground on Feb 2, 2006 - 14 answers