Listen to conversations over long distances with a homemade laser listening device. All you'll need is a laser pointer, tripod, old pair of headphones, photocell and a recording device. Your completed laser spy microphone won't be the most practical recording setup you've ever used, but it's an interesting bit of science and a great DIY project. The process involves a simple bit of soldering, but in all it's very simple.

 

Tags: stargazing