+1 - as someone who HAS driven a formula race car before (even one not remotely as fast as an F1 car, but still immensely quicker than any street car), I can confirm that it is VERY physically demanding. You wouldn't believe the amount of effort it takes just to keep your head upright. I'm a fairly decent athlete (although not pro caliber), yet before doing a concentrated workout routine, I couldn't go more than about 5 laps before I was just too physically tired to continue safely.
It's a fairly minor workout for your legs (although remember that the brake pedal of an F1 car takes nearly 100# of force to push down, ~15 times a lap for 50 laps), but it is a VERY intense workout for your arms and neck.
Anyone who doubts this - I challenge them to just 5 minutes in a 125cc go kart. Despite having nowhere near the capabilities of an F1 car, you'll still get a sense of the physical exhaustion involved. If you can go 20 minutes (at speed) without special training, I commend you.
Was considering a switch (for our locally cached DNS servers parent servers), but glad I ran a benchmark first:
Cached relative performance:
Uncached relative performance:
In all cases, Google's one of our slower options. If anything, it appears I'd be best off using local DNS backed by level 3 for non-cached results.
I know for a fact they're not 100% accurate - Verizon's map shows 100% 3G coverage for all land within a 20 mile radius of my in-laws house. However, Verizon customers (them) get zero signal there (even when standing outdoors away from any obstructions) - not even enough to send a text message.
Conversely, AT&T shows zero 3G coverage there, and "spotty" EDGE coverage within a 20 mile radius. However, I (AT&T) get nearly full 3G signal there, with great speeds.
However, one case point like this only shows they're not 100% accurate, it makes no indication of a general trend between the two.
What would be very interesting to see is an exhaustive third-party study with a decent resolution. What would be involved in calculating this for all major nationwide carriers (AT&T, Verizon, T-Mobile, Sprint, etc.).
"Gravitation cannot be held responsible for people falling in love." -- Albert Einstein