Featured Links - September 22, 2019

Links to things that I found interesting but didn't want to do a full post about.

• Physicists Finally Nail the Proton’s Size, and Hope Dies. The headline is hyperbolic but there's some seriously fundamental physics here. 
• Here’s what happened in the impact crater the day it did in the dinos. Geologists got a core sample from the centre of the crater. 
• How to spot a bot. A handy infographic to help you identify bots in your Twitter feed. 
• The Big Business of Scavenging in Postindustrial America. There's big money in all that junk.
• Digital Hearing Aids Turn the Whole World Into a Giant MP3 File. If you need hearing aids, you probably can't hear the difference between an MP3 and full range audio anyway.
• AI for ophthalmology: Doing what doctors can’t. I must show this to my ophthalmologist the next time I see her.  
• When You Electronically Sign Documents, Always Keep a Copy. If you're a freelancer, you should read this.