ExTechOp's channel

Quite many hotel rooms these days have a small safe with a client-settable keypad combination. Unfortunately, many of these also come with the defa...

This is a close-up of the discharge from the business end of a Tesla coil a friend has built. The noise it makes is quite loud, we were wearing ear...

The 8-minute flashmob that finished off the MEGA Finland geocaching event: first 6 minutes of intense searching for geocache, a two-minute freeze a...