That's the concentration at the detector on the car. Many of those leaks will occur in an partially enclosed space which would allow gas to accumulate and eventually explode.

Every leak has a concentration gradient going from 100% at the source though the explosive range and eventually to the background level far away from the leak. The important part is whether there is a sizeable volume that is within the explosive range.

Can somebody explain how, WITHOUT USING A KEYBOARD, you can exit a Metro app on the desktop strictly by GUI?

Just move the mouse to the lower left corner of the screen and click the start button that appears.

Eventually XP may no longer be practical, the hardware you have may fail, etc.

You are right that there's nothing compelling you to switch, just as there's nothing forcing you to drive a car with ABS, seat belts, fuel injection, etc.

The killer feature for Windows 8 is the tablet interface, but for that to matter, you'd need to buy a tablet.

You should just sort out all the non-standard cards and focus on the standard ones only. By scanning a full bed of standard ones, you can slice them apart using a macro or script in Photoshop or the GIMP.

Another idea is to use an overhead transparency marker to draw a grid on your scanner, which will allow you to use the same crop script, but with odd sized cards.

Do realize that when you get a business card scanner, you are also getting the OCR software to help manage the info. Having a bunch of JPG or TIFF files isn't much better than 400 business cards.

This does seem like a strange plan, but one thought that occurred to me is that, probably, when the big content owners are negotiating about how much to charge for streaming (or deciding if they will even be available), the fact that their content is already available on Netflix via the DVD service makes it hard to force them. Imagine after this change, where if you have the streaming only service, even the recommendations don't show the DVD-only titles. Except for certain big titles that you search for, you will never know what you are missing, and those titles will drop off the radar. And if you are happy with the streaming-only titles, then what is your incentive to go with the separate DVD-by-mail service.

This may help the big content owners come to their senses and allow streaming, or even download rental. I think what we are seeing are the effects of the current and impending shakedowns by the content owners, who prefer to own the channel and thus the profit inherent in the channel.

A facsimile has legal precedent; a faxed copy of a signed contract has the same legal weight as the original document. A scanned PDF or email with a JPG signature or whatever isn't going to work the same way in court.

It is also dead simple to use and relatively cheap.

Change the DNS records to point to a new ISP mirroring the old contents.