Rob say: "I spent way too much time making a solid-ice beer tray, but I still feel it was worth the effort. To be truly complete, I should have test floated it in a pool or hot tub, but the bottle opener kept short-circuiting my experiments."
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects