One should know. Apparently, some don’t notice for awhile.
(Do not tap if gnarly medical stories upset you.)
Tap for spoiler
When I asked her to look down, I could see the edges of a couple of contacts stuck to each other. Pulling them out, I felt like I could still see more and asked my assistant to get my phone to record the removal.
Asking the patient to look down again, I could see a huge, dark-purple blob of contact lenses stuck to her eye. It almost looked like a second pupil. I gently started using a Q-tip to peel the lenses apart one by one, like you would deal a deck of cards. They were coming out in a chain, drooping down her lid. There were a lot of contact lenses — I thought this could be my Guinness Book of World Record moment.
https://www.businessinsider.com/doctor-removes-23-contact-lenses-from-patients-right-eye-2022-10

























Veritasium - Energy doesn’t flow in wires
https://www.youtube.com/watch?v=bHIhgxav9LY
Veritasium - How electricity actually works
https://www.youtube.com/watch?v=oI_X2cMHNe0
Veritasium - Making the blue LED (for the n-type, p-type demos of electron flow)
https://www.youtube.com/watch?v=AF8d72mA41M
Mass of electron, (early fundamental experiments)
https://en.wikipedia.org/wiki/Electron_mass