M-Lab is open to applications from researchers who develop and maintain open source network measurement tests that conform to our goals and support our mission . However, the vast majority of proposed M-Lab tests are not accepted because of the high standard that M-Lab sets for the tests that we host. We require all tests to be actually initiated by an end-user; that is, we don’t allow automatic tests to be run between measurement points on the platform. And the test must be remotely managed from a systems perspective; a test installed on our servers must start up and begin waiting for people to start connecting to it to run their test. These active, client-initiated, off-net network measurement tests must examine the full network path between the consumer and the Internet.
The question of grill marks comes up often in this flipping debate. It's a fact: unless you are very careful about the orientation of your steaks when flipping them, flipping multiple times will not produce the picture-perfect cross-hatched grill marks you can get out of a single flip. But this is not necessarily a bad thing. Indeed, I've heard it very effectively argued that grill marks are overrated and that better, more even browning should be your final goal. Check out this great post on Amazing Ribs for arguments in favor of no grill marks.