Yeah, I have a lot of those too. I even ended up with a duplicate copy of Civ IV and all its expansions, plus games like Sniper Elite and Red Faction: Armageddon that I definitely never purchased. Also, the multiplayer for a lot of games is a separate Steam title.

For those not interested in helping useless middle-man ad farms, here's the original source on the National Archives website (including the YouTube video):

How Computers Changed the Tax Game

I suspect that the hover mechanism could do a fair bit of the work; but I posited additional elements because it would be a bit of a downer if the hover mechanism were tuned too far in the direction of being a good thruster/steering element, since you'd be walking a potentially touchy compromise between being capable of aggressive maneuvers and being inherently stable, rather than liable to assist you in tipping over even faster and harder that gravity would cover if you leaned too far out of the equilibrium position.

Just for the sake of consumer safety and not reducing bystanders to hamburger too often, the preferred arrangement would probably be some sort of EDF/Vectored thrust arrangement: all the advantages of a standard electric propeller (ambient-temp exhaust, none of the noise and fuel-line hassle associated with teeny internal combustion engines, runs on normal batteries rather than some sort of hobby fuel); but no exposed blades to do surprising amounts of damage upon somebody's first mistake.

You'd have to avoid going too deep into propeller-beanie-chic zones of absurdity; but if you could get the actually-hovering bit worked out, I suspect people would overlook that for the chance to zoom around at dubiously sensible speeds.

For various definitions of 'informed'.

Well, to be fair, it is economics. Not sure what else they could do.

Pieces parts. Parts is parts.

My order to shut down power / comms to the cell towers trumps your open - source baseband (if you even managed to get one going which is highly unlikely).

Signed,

Your local despot (or US Federal government, what ever makes you unhappiest).

All you have to do is turn off the power to the towers. You don't have to fiddle with individually shutting down handsets. Or just jam the frequency. If it's AT&T they don't have to do anything at all, the network will just get busy and quit working.

The Economist. Still worth reading.

E = (T2-T1) / T1

Everyone with an engineering degree knows this. Trying to extract much energy from low-grade heat at the output end of an engine is inefficient. This was figured out a long time ago. Here it is in The Manual of the Steam Engine. It's possible to increase steam engine efficiency by compounding, where the exhaust from each cylinder feeds a larger, lower pressure cylinder. This is cost-effective up to about 3 cylinders ("triple expansion"). Engines up to quintuple-expansion have been built, but the additional power from the last two cylinders in the chain isn't worth the trouble.

In 2005, this appeared in SF Weekly, about the gentrification of the Polk St. area of the Tenderloin:

That was back in 2005. Gentrification won.

Well, you could build a thermoelectric shell around the entire earth... Of course, if you can do that, 'stop global warming' is probably something you did in high school as a busy-work lab project at your school for particularly gifted hypersentient disembodied intelligences.

My (admittedly pretty hazy at this point) memory of heat engines is that their theoretical peak efficiency depends on the thermal delta they manage to achieve. Exactly the same resource that thermoelectric materials scavenge (albeit at miserable efficiency) into electricity.

Anybody who actually has some grasp of the matter want to chime in on where and why you would use thermoelectrics (and how efficient they would have to be) rather than simple insulation or one of the various waste-heat-recovery systems that transfer some amount of the heat remaing in outgoing exhaust gases into incoming working fluids?

Is the thermoelectric advantage purely that, assuming material reliability is OK, they are a 100% solid state, trivial to scale from 'handle with tweezers and magnification' to 'pretty large', and their output is easy to transfer and useful for all kinds of things after just a little DC-DC cleanup, or are there actually situations where they might be absolutely more efficient than insulation and heat recovery, rather than just easier to tack in almost anywhere in a design that you have a few extra cubic centimeters and expect a temperature difference?

Reminds me of a 3Com Audry another product that had marginal appeal and bad timing.

In a lot of ways, Jobs was lucky with the iPad but he was also way smart in getting the iPhone out the door and accepted. No one, and I mean no one, had managed to get tablets to be anything but a niche item before the iPad. And people tried.

This is a lie, plain and simple.

In fact, the exact opposite happened.