STANDARD OF TASTE

Two of Sancho's kinsmen tasted the wine.

One said it was good — except for a faint taste of leather. The other agreed — except for the iron. The village laughed at both. Then the barrel ran dry, and at the bottom: an old key on a leather thong.

Hume's point: delicacy of taste is real, physical, and checkable. Now you taste. 3 practice pairs with the answers shown, then 15 scored ones. In each, one clip is the original and one has been quietly damaged. Find the key in the wine.

~10 minutes. No sign-up. Headphones strongly advised.

How this is measured. Item behaviour, reliability, and what the numbers can carry.