Start Carbon dating nuclear testing

Carbon dating nuclear testing

The human hippocampus, Spalding and Frisén discovered, was continually creating small numbers of neurons.

Inertia causes heavier atoms, like C is incorporated into all living things: by plants that use carbon dioxide for photosynthesis, by the animals that eat the plants, by the animals that eat other animals that have eaten plants.

Other cells, like those in the adult brain and nervous system, have been viewed as more like the Mona Lisa. Spalding, once a postdoc at the Karolinska Institute in Stockholm, Sweden and now a professor there, knew there were tantalizing hints that the adult hippocampus—a seahorse-shaped region deep in the brain that is important for memory and learning—could regenerate neurons.

But without knowing exactly when each neuron was created, scientists couldn’t say with any certainty that this was true.

To our bodies, one type of carbon is as good as any other, so C in DNA because, while other molecules are frequently refreshed throughout a cell’s life, DNA remains constant.