Ali Abdaal on Instagram: "How did a study about lighting provide an insight into human psychology and our productivity? Well back in the 1920s, researchers went to the Hawthorne Works factory in Chicago to study how lighting affected workers’ productivity. They made the lights brighter and productivity went up… Then they made the lights dimmer and productivity still went up… Even when they changed the lighting back to the original state, productivity remained higher than before. What was going o