Perhaps the most perplexing alarm clock hack found in the pages of Popular Science is this elaborate setup that will automatically close your bedroom window at a specified time. Cool, yes, but so many questions are left unanswered: Is the closing of the window intended to wake you up? If not, couldn't you just close it yourself once you got out of bed? Do you only need fresh air while asleep? If you can discern the purpose of this invention and would like to replicate it yourself, use a bolt to hold the window up, and mount an alarm clock just below it. Solder a piece of stiff wire to the alarm-winding key and line it up with the hole in the bolt, so when the alarm goes off, the key turns, sliding the bolt away from the window. Use an iron pipe to weight the window, so it will slide down on its own when the bolt is removed.