Do some nucleic acid modeling.
GCAT sounds like a test, doesn't it? Graduate College Admissions Test or something. It is sort of an admissions test for living organisms, when you think about it.
Name something that your parents gave you which you can't return. No, not a hand-knitted sweater. (Although we don't recommend returning those either. It's best just to leave them in the back of a drawer to pull out during visits.) The answer we were looking for was your DNA. You are a unique combination (unless you're an identical twin, triplet, member of a clone army determined to take over the world, etc.) of your parents' genetic material. All those little Gs, Cs, As, and Ts stitched together in a pattern that spells out you. In a pattern that sounds something like a cat with a hairball if you try to pronounce it. Which is why it's best just to admire it. Quietly.
Each 3D double helix pendant, made from base metal coated with pure silver, is around 1" long with silver plated stainless steel ear wires
For our customers with nickel allergies: the earrings are made from base metal but they and the ear wires are plated with pure silver (not Sterling) or gold.