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3 weeks ago I bought a couple of these diffraction glasses from Alexzupinhea. After they arrived, I played around with them a bit and came up with two simple-to-do experiments which may have some practical merit for one or the other. The first one is on how to check your lasers wavelength. This...

3 weeks ago I bought a couple of these diffraction glasses from Alexzupinhea. After they arrived, I played around with them a bit and came up with two simple-to-do experiments which may have some practical merit for one or the other. The first one is on how to check your lasers wavelength. The...

This afternoon my PC monitor broke: I can see the image very faintly under certain angles, it's obvious that the backlighting is not working any more. I've taken it apart, but didn't get very far: I got it separated into the plastic housing, a PCB with lots of components and a big frame with the...

I've been in Shanghai for a week and brought back my first green laser (supposedly 50mW, but comparing with my ~270mW red, I'd say it probably is just 15-20mW, they appear more or less similar in brightness... pity I don't have access to a LPM). Now I'm wondering, what drivers do these cheap...

I just saw I got a notification for a "Social Group Invitation". Clicking on that, I can see which group and what's going on, but there's nothing like "accept"/"decline" or whatever. How's this supposed to work?

Looking around the o-like website, I found this green laser star pointer. It has this charming description: Project millions of green moving stars full of whole room, Beatifule and amazing ! Seems you are in the constellation .it is widely used as the decoration for the home, cafe, bar and so...