Scientists have created an artificial synapse that works with water and salt, mimicking the medium used by our brains. This could lead to more efficient and energy-saving brain-inspired computers. The device, called an iontronic memristor, consists of a microchannel filled with water and salt, and can process complex information by altering the concentration of ions in response to electrical impulses. This research is a significant step towards computers that can replicate the capabilities of the human brain more accurately.