>"No problem" in place of "You're welcome" is something I have noticed a lot lately. It has become a running joke between my older daughter and me.
In high school I was taught to reply with "not at all", but that one seems to be out of fashion, or only used in Argentinean schools :). Here I heard almost everyone to say "no problem" (some say just "sure") so I got used to it.
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges