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At dinner one night I was offered yak-butter tea, the Tibetan staple. To my dismay, it tasted as foul as it sounded. I felt it was important to be polite, so I took a big sip. My cup was topped off almost immediately. I took two more big gulps, and each time it was topped off. I was feeling queasy, and I was convinced I would throw up right there at the table if I took a fourth sip. I had choked down almost an entire cup just to please my host, and yet my cup looked untouched.

"Don’t you want to try the tea?" I was asked.