The hand of an x-ray technician in the early 20th Century. Because the dangers of prolonged exposure weren't understood it was normal for the techs to test the machine's calibration on their own hands - Upgoat

The hand of an x-ray technician in the early 20th Century. Because the dangers of prolonged exposure weren't understood it was normal for the techs to test the machine's calibration on their own hands
submitted by Centaurus to Mildlyinteresting 3 weeksApr 16, 2024 19:01:47 ago (+32/-2) (files.catbox.moe)
https://files.catbox.moe/6rf5d2.jpg

Same thing with wireless communication devices today. Bluetooth, wi-fi, mobile phone,...