temporary versus permanent

Elsewhere on the interwebs, I follow Glenn Shepherd, an ethnobotanist who works in ... guess where? (If you guessed the Amazon, you (a) are correct and (b) have been reading this blog for more than two entries.) He wrote about an ergot-related fungus on a certain sedge which is used medicinally by the Matsigenka people.

One time when Shepherd had a headache, he was treated with some of this sedge. The headache disappeared almost instantly ... and he gained a temporary ability to juggle. He write...