The winter solstice, Dec21, should be deemed international brain day. This extraordinary product of evolution can differentiate between red lights, green lights, blue flashing lights, yellow lights, traffic lights, Christmas lights, headlights, silver lights, tree lights, police lights, cat eyes and 30 mile-an-hour warning lights; whilst listening to the radio, deciding what to give your husband/partner/family for Christmas, mopping the windscreen, turning up the car heater, accelerating, braking, changing gear, and putting on the windscreen wipers. Pretty good piece of kit, I'd say