Neal Stephenson Quote

Yul had simply launched himself at the guy from some distance away, and body-checked him at full speed, stopping on a dime in midair as he transferred all of his energy into the target.
"Conservation of momentum," he announced, "it's not just a good idea—it's the law!"

Yulassetar Crade removes a TV reporter in zero gravity, Part 12, "Requiem" - Anathem (2008)