There is a sharp curve on our Bastrop State Park road that has a deer crossing sign. When ridding through I heard in front of me tiers screech to a stop. At the curve was a lady stopped in her car who just barely missed a large deer. I slowed down to a stop and she stated through her window..."Man... We gotta move that deer crossing to a better spot..." We both laughed remembering seeing the cartoon in a Readers Digest long ago...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)