You need to either create a slurry in a cold liquid, which also works with cornstarch, or you've got to do your gravy in a very wide pan and kind of scatter the flour over the top and then very quickly whisk it in.
Alton BrownEnough people have now mentioned Bill Nye the Science Guy to me that I now desperately avoid it all costs.
Alton Brown'Outlaw Cook' was a revelation. Folks like Jeff Smith and Marcella Hazan got me interested in cooking, but John Thorne pushed me into the path that I follow to this day. This is the only cookbook I've ever read that understands how men really eat: over the sink, in the dark, greasy to the elbows.
Alton Brown