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Comment Didn't look at all convincing to me... (Score 1) 221

by qazxswedc (#61187820) Attached to: Man Loses $560,000 in Bitcoin Scam From Fake Elon Musk Account
I saw the site and I didn't think it looked at all convincing. It was a ".info" site which I'd not heard of Musk having before so I did a quick look online and it was registered to some dude in Russia (didn't save the name). After I had been on the site and watched the amount of "remaining bitcoin to be matched" count down a bit, I opened it in a different (brand) web browser. It started counting down from roughly the same place my original browser did...so it was now showing me one browser saying there was 284 bitcoin left to give away and the other said there was 452 or something like that. Additional tabs/copies of each browser matched the numbers shown in the first copy of that browser. So then I got curious and pulled up the page source and the log of transactions was client-side scripting generating random "transactions."

Comment It's at least as much about understanding (Score 1) 1086

by qazxswedc (#40939767) Attached to: Ask Slashdot: How Many of You Actually Use Math?
When I'm working with someone who's designed a horrible database system and they can't grasp the concept of exponential increases in difficulty (and therefore search time), it's a problem. I myself have implemented PID controller loops in systems I've developed. I may not have needed 3 years worth of calculus to do it, but I at least had to understand what I was doing and the significance of errors rather than blindly guessing why I didn't have it "right". Most common example of a PID controller people have seen is cruise control in a car. It's not as simple as "if speed preset, press gas harder, else ease off". Now, that said...where I went, you didn't need any truly hardcore math to get a CS degree...a basic calc class and discrete were about it.
Hardware Hacking

Grad Student Invents Cheap Laser Cutter 137

Posted by samzenpus from the frugal-cutting dept.
An anonymous reader writes "Peter Jansen, a PhD student and member of the RepRap community, has constructed a working prototype of an inexpensive table-top laser cutter built out of old CD/DVD drives as an offshoot of his efforts to design an under $200 open-source Selective Laser Sintering (SLS) 3D printer. Where traditional laser cutters use powerful, fixed-focus beams, this new technique dynamically adjusts the focal point of the laser using a reciprocating motion similar to a reciprocating saw, allowing a far less powerful and inexpensive laser diode to be used. The technique is currently limited to cutting black materials to a depth of only a few millimeters, but should still be useful and enabling for Makers and other crafters. The end-goal is to create a hybrid inexpensive 3D printer that can be easily reconfigured for 2D laser cutting, providing powerful making tools to the desktop."

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