
You remember all the good old days when all it took to get into your best friend’s treehouse was some secret knock you all formed. Even if you never experienced that yourself, every little kid wishes for that kind of a code. Well now as a full grown adult, you can create a similar item that does that for your full sized house. Don’t worry, it’s a bit more secure than just some guy standing on the other side waiting to turn the lock on your cue.

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While it might be called the 
See that picture to the left? Beautiful, isn’t it? Believe it or not, it wasn’t shot by a million-dollar satellite, but a simple handheld camera by two M.I.T. students who haven’t been to space, yet.




