Health - the London bus driver vs.bus ticket guy

 Drivers, sedentary, many heart attacks. 

The conductor (ticket guy), always walking up and down … much healthier. 

The kids should learn. 

Physics double slit experiment- good explanation

UPDATE2- even better info at 5:33 https://www.youtube.com/watch?v=L9ub_B71U0E

UPDATE  the ohysics lady has a more accurate description https://m.youtube.com/watch?v=fbzHNBT0nl0

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 Still a mystery at the end. One comment asks what I want to know… if you turn off power to the measuring devices, what happens? 

https://m.youtube.com/watch?v=7iKebDDs2Pg&t=1520s

It is also super weird that either wih a computer measuring plate or and old school plate you get same results. Or is the plate the same kind of material? 

Part of me still feels like we r not given all the info of how they are doing the experiment.