A study found that humans generate brain cells throughout life and the process does not decrease with age, as previously thought. The study used the radioactive isotope carbon-14, released by nuclear bomb testing during the Cold War, to date the age of adult human brain cells by measuring the number of carbon-14 atoms in the brain regions of different populations. The study found that a subset of neurons in the hippocampus continually renews itself, and the team estimates that humans generate around 1,400 neurons every day.

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