Things I learned lately 15 Oct

• There's a grocery store in Denmark (consistently recognized as one of the happiest countries in the world) where shoppers must smile at a computer monitor in order to gain entry into the store. Yes, if you're a grump the doors won't open for you! You can check it out here. https://steemit.com/news/@danibehram/give-me-your-smile-i-need-your-smile-store-in-denmark-opens-its-doors-smile-just
• The Los Angeles streetcar system was primarily operated by Pacific Electric (1901-1961) and developed into the largest trolley system in the world by the 1920′s. Residents and visitors alike could routinely traverse from Santa Monica to San Bernardino. Many modern communities were built around the streetcar network. The system, at its peak, included over 1,100 miles of track with 900 electric trolley cars.
• Thousands of years ago, most adults could not drink milk (lactose), but they could eat yogurt and cheese, which has less lactose. Those who don’t have lactose intolerance have a genetic mutation.
• Ancestrally humans are 'persistence hunters'. That is, our main tactic for catching prey without fancy weapons was to just run them down, because animals aren’t marathon runners and they can’t dissipate heat like we can.
• When you first set your sight on the seconds of a watch (or anything with a rapid regular movement) you will sometimes feel like the first second lasts a little bit too long. It's because your brain replaces the motion blur that happens when you move your sight from wherever it was to the watch with a fixed image. And the cool thing is that it replaces it after the fact, or rather gives you a very short false memory that you were already watching the watch while your eyes were moving, making that first second seem longer. It's called Chronostasis.
• Blood donors in Sweden get a text anytime their blood helped a patient.