Autocorrect made it "Gods" instead of "Good", and I didn't notice before posting.

Gods thinking. But two potential problems that spring to mind:

The petal profile seems to matter, although I admit to not knowing why. You'd have to have your sphere replicate that outline from the various appropriate angles.

Controlling reflection of stray light back into the telescope is already identified as a potential technology problem. A sphere may make that even more of an issue.

You are correct that there is not an orbital alignment that would passively keep the telescope and shade in alignment with a star. They plan to put the system in a solar orbit (so that the speed at which alignment shifts will be slower than if it were in Earth orbit) and also they will have to actively guide the telescope using ion thrusters in order to maintain the correct alignment during an observation. Because of this, observation windows will be relatively short. This requirement for active guidance during observation is one of the technology risks identified in one of the links above.

Agreed. I wasn't trying to imply that making a mobile site work that way was hard. Frankly, was trying to imply it was relatively straightforward. It's always possible a big company borks something easy, but I fully expect that the need to switch to the web to purchase a comic book will be only very marginally less convenient than in the app. (I admit that in the app would always be the more elegant system, but it really doesn't have to be a big deal if Amazon is smart about it.)

Not really sure why giving your credit card info to Amazon is any different than giving it to Apple.

Just make the mobile web site work well, and it's hardly jumping through hoops. Someone mentioned how easy it used to be to buy the next issue in-app. Just make is so when you go on the web site, the next issue is right there waiting for you to buy it (the app can report back which issues you've finished). It would add all of 15 seconds to the purchase process.

I understand there's still a hoop there, but they don't have to be holding it very far off the ground, and it's certainly not on fire. They could easily make it a little hop, not a huge jump.

Falcon Heavy will have significantly smaller payload capacity than NASAs SLS. Perhaps you mean Falcon X (or maybe they call it Falcon X Heavy, hard to keep straight), which is planned to have similar capacity to SLS. NASA is way ahead of SpaceX in development, but has all of the baggage of being NASA, so we'll see who finally gets a vehicle with such capability done first. Don't bet against Musk.

What an absolutely lame response. Those systems exist only as experiments, not as systems that are actually safe to drive on the streets. :rolleyes:

Pumping a liquid around at a constant elevation doesn't have a very high energy cost. I imagine you'd lose far more energy through the round-trip chemical reactions than you would through pumping the liquid around.

Storage density is only a problem for portable systems. For fixed storage installations, the important question is "what does it cost per ampere-hour of storage?" Inefficient storage that is cheap can beat highly efficient storage that is expensive.

Of course, to correctly calculate costs one needs to include things that are the result of storage density, like land acquisition and construction of holding tanks. But if the storage medium is cheap, it could come out ahead of some higher density system that has a more expensive storage medium.

Even conversion losses become less of an issue if the storage is cheap enough.

In an emergency brake, you [i]do[/i] slam on the brakes 100%. And communications doesn't matter. For two reasons. First, communication can fail. There's no such thing as a 100% failsafe wireless communication system, so you should not be driving in a configuration that requires 100% perfect communication to be safe. Second, the system you describe requires that the lead car(s) not brake as quickly as possible. So you could easily end up with a situation in which the lead car could have stopped in time to avoid a fatality, but couldn't because of the choice to operate in a train. That's a decidedly idiotic result.

Furthermore, braking isn't the only potential scenario. If the lead car swerves, and the car behind is two feet behind, it may not have enough time to swerve. And, similarly to braking, wireless communication cannot be relied on as a solution to that scenario.

The situation you describe is simply unsafe. No amount of futurist handwaving will change that.

This is a nonsense dream of self-driving car afficionados. It will always be dangerous to drive that close, even if the computer is doing the driving. Different cars have different stopping distances, even the same make/model/year will vary simply because of variable tire/brake wear. In an emergency stop situation, the "couple feet" distance between cars is simply unsafe.

Assuming we're talking about the 2006-2013 C6 Corvette, it has a drag coefficient of 0.28. Lots of production cars have that kind of efficiency. Hell, the new CLA is 0.23. The Prius is 0.26. That Corvette drag coefficient is attractive, but hardly the best of any production car.

Frankly, I'm suspicious of the claim. Note that he was comparing an actual mpg measurement to the rated measurement. Those are not always apples-to-apples. Or the rating speed could happen to be an inefficient speed (given the Corvette's gear ratios). In other words, there will be a speed around 55 mph where a Corvette gets better mileage than it does at 75 mph -- it just might not be exactly 55 mph (or whatever speed they use for "highway") where that speed occurs.

LOL... No. That doesn't happen. You can stand in the sun all day in 25C temps. You might get a bad sunburn. You might get dehydrated. But your brain doesn't heat up and fry in your head.

Hell, where I grew up it was regularly 45C+ during the day. You had to worry about staying hydrated, and about getting sunburned if you didn't have a good tan (or use sunblock), but otherwise you could be out in the sun for hours without your brain overheating and killing you.

The point is that more people aren't getting these maladies. At least not in any way that would correlate with the dramatic increase in exposure to cell phone and WiFi signals.

But I do agree that we can almost certainly show that signals of these types do show up as at least minor changes in cell activity. But is that leading to brain cancer? If it is, then where's the brain cancer spike we should see related to the spike in exposure to these signals?