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Comment: Re:Alternate Bank of Canada Press Release (Score 1) 221

by mirix (#49186335) Attached to: <em>Star Trek</em> Fans Told To Stop "Spocking" Canadian $5 Bill

Here's the rules, FWIW. Pennies are only valid to 25c.

(2) A payment in coins referred to in subsection (1) is a legal tender for no more than the following amounts for the following denominations of coins:

        (a) forty dollars if the denomination is two dollars or greater but does not exceed ten dollars;

        (b) twenty-five dollars if the denomination is one dollar;

        (c) ten dollars if the denomination is ten cents or greater but less than one dollar;

        (d) five dollars if the denomination is five cents; and

        (e) twenty-five cents if the denomination is one cent.

Comment: Re: Star Wars! (Score 4, Interesting) 253

by mirix (#49162621) Attached to: 20-Year-Old Military Weather Satellite Explodes In Orbit

These ran NiCd cells. Here's some TL;DR from NASA about a variant of NiCd they use(d), not sure if it applies here.

http://www.nasa.gov/offices/oc...

Short notes:
Fancy NiCd, Higher density and sealed. They rely on precise chemistry to be hermetically sealed units (lean on one element, for limiting and only O2 production).
High pressure at full charge (~60PSI at room temp), higher if things go south, Pressure drops with charge state.
Excess discharge causes hydrogen production.

So, tin can, pressure changing with charge cycles (metal fatigue over many cycles?), H2 production, O2 production... maybe there is some chance for catastrophic failure there.

Comment: Re:Perhaps it wouldn’t pass today’s .. (Score 2) 286

by mirix (#49077111) Attached to: 1950s Toy That Included Actual Uranium Ore Goes On Display At Museum

I'd imagine more harmful to ingest/inhale uranium ore... in addition to radioactivity, uranium is also a heavy metal like lead. (in both senses of the term "heavy metal".)

However most ore is quite weak, with 1% being pretty decent... I think it's economical to mine it as low as 0.1%. A few mines in Canada are near 20%, though (which I suppose is related to Canada being the biggest producer... 1/5th the ore is end product, instead of 1/1000th!). Ore will often have lead and such in it as well (decay products), which is also toxic.

Comment: Re:Not Sure If Good Or Bad (Score 1) 164

by VAXcat (#49061387) Attached to: Researcher Developing Tattoo Removal Cream
With his hands in the pockets of his jacket, he stared through the glass at a flat lozenge of vat grown flesh that lay on a carved pedestal of imitation jade. The color of its skin reminded him of Zone's whores; it was tattooed with a luminous digital display wired to a subcutaneous chip. Why bother with the surgery, he found himself thinking, while sweat coursed down his ribs, when you could just carry the thing around in your pocket?

Comment: Re:Nothing unusual really (Score 1) 192

by VAXcat (#49017361) Attached to: Xenon Flashes Can Make New Raspberry Pi 2 Freeze and Reboot
"There's plenty of cases of electronics misbehaving due to exposure to strong light"...Around a million years ago, when the earth was young and laser printing hadn't been invented yet, I was an electronics tech working on phototypesetting machines. These machines (Mergenthaler VIPs) had a large zoom lens mechanism in them for producing different size print. One afternoon, a junior tech called me over because, he reports, "the zoom lens on one of the machines is going crazy". I get there and see that the zooms are running back and forth,. full speed, at random. I noticed the tech has a trouble lamp inside the machine. I turned it off and the lenses stopped their manic dance. He hadn't realized that the zoom lens travel was controlled by optical switches - the lamp turned them all on at once, producing the crazy bahavior.

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