How cool are isotopes?!
I know, too cool, you say.
When someone links isotopes to beautiful coral to Hawaiian settlement in 1575 CE, it gets a million times cooler.
These guys figured out a way to use 238U-234U-230Th dating to estimate the age of corals found in early Hawaiian structures. Using these dates and Hawaiian family trees, they have figured out who was on the islands and when they were there... knowledge previously relegated to the "sometime between 1000 and 1800 C.E." bin.
They not only figured out a more precise time-frame for early-Hawaiian settlement, but also showed just how quickly social change can occur: a group of islands went from independent family-groups to a structured proto-civilization within 30 years!
Cool.
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