Last night, after the sessions were over, I found myself in a bar with two locals who work at a prominent Denver-area restaurant.

I asked them who, of the Denver conference circuit, were the best tippers. Surprisingly, they said that attendees of the annual sex business convention were most generous. Bible conferences tended to be the worst, possibly because they didn’t drink much.

Physicists, they told me, lie in the vast middle ground between the God-squad and the pornographers. But they do distinguish themselves in one way: they leave very precise tips. For example, they would leave a tip of $7.23, exactly 17% of a $42.50 bill.

The servers wanted me to ask all of you to start rounding, preferably up.

Last night, after the sessions were over, I found myself in a bar with two locals who work at a prominent Denver-area restaurant.

I asked them who, of the Denver conference circuit, were the best tippers. Surprisingly, they said that attendees of the annual sex business convention were most generous. Bible conferences tended to be the worst, possibly because they didn’t drink much.

Physicists, they told me, lie in the vast middle ground between the God-squad and the pornographers. But they do distinguish themselves in one way: they leave very precise tips. For example, they would leave a tip of $7.23, exactly 17% of a $42.50 bill.

The servers wanted me to ask all of you to start rounding, preferably up.