The brain's learning switch: Two cells control memory

How does the brain transform experiences into lasting memories? Neuroscientist Marlene Bartos studies two key neuron types that control learning. Principal cells store information, while inhibitory neurons regulate and fine-tune their activity. Their interaction determines which signals become stable memories. Also on the show: Do IQ tests really measure intelligence? Plus: We follow the release of lynx back into the wild, join an avalanche researcher studying dangerous snowpacks, and accompany a geologist searching for natural white hydrogen deep beneath the Alps.