Back in the lab, Chen analyzes the tufas' chemical isotopes
to determine when the reefs were alive and consequently when the lakes were high and rain was plentiful.
Members of Chicken Coop are tackling analysis of the diet of ancient chickens, using chemical isotopes
in their bones and egg shells, to reveal the resources available to the humans who kept them.
For the findings, the scientists used chemical isotopes
in ancient soil to measure prehistoric tree cover - in effect, shade.
Judging people by their hair isn't shallow, it's sound science: The proportions of certain chemical isotopes
in someone's tresses can help detectives pin down that individual's region of origin and recent movements, a new study suggests.
EP Boron also produces complementary chemical isotopes
used in the normal operation and control of nuclear power plants.