Mind
Why thinking hard for several hours can leave you mentally exhausted
Prolonged concentration may cause a compound called glutamate - which can be harmful at high levels - to accumulate in regions at the front of the brain
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Prolonged concentration may cause a compound called glutamate - which can be harmful at high levels - to accumulate in regions at the front of the brain
Corvids such as rooks and crows seem to have a unusually high number of interneurons, brain cells involved in processing information