I know for my MMO, and for many others, you can't log into more than 1 character off of 1 account at the same time. I can run two instances of the game, and log into two seperate accounts (for market/vending/extra-storage purposes) at the same time. But if I try to log in a second time under 1 account, the first instance get's disconnected...

Except sound cancellation isn't what they're talking about here. FTFA: The array of speakers then aims a mix of white noise and randomised office hubbub at the eavesdroppers. The subtle, confusing sound makes the conversation unintelligible. White noise and random office hubbub is NOT an inverse waveform...

Pu-238 is useless as a weapons isotope because, while being a fertile material, it is NOT a fissile material. This means you need some neutrons to turn it into a fertile material before it fissions. ie. 238 + n = 239 + n = bang.

Whoops, I totally forgot to login...damn it's way too early/late... Explosives detectors discriminate against gunpowder/residue. This is for a majority of reasons, a large one being, lots of people own guns, and shoot guns, and dealing with the paperwork of a positive hit for every person going to the shooting range would be expensive and man-power consuming. I know this because I've asked our guards. I work at a facility (not telling what ;) that has GE brand explosives detectors before the x-ray and metal detectors. The guards still have to go through them, AR-15s, 9mms, ammo, and all. If the detectors didn't discriminate against munitions residue, no guards would be able to clear it. And no, they don't all fire their weapons all the time, so they don't always have residue on them. But they do regularly go to the site shooting range and conduct training on site that uses blanks. It's like laser tag, with machine guns and blanks...I wish I could have a go at it... =D