"... Linus started learning Intel assembly language. One day he showed me a program that did multitasking. One task or thread would write a stream of the letter "A" on the screen, the other "B"; the context switches were visually obvious when the stream of As became Bs. This was the first version of what would later become known as the Linux kernel." https://lwn.net/SubscriberLink/928581/841b747332791ac4/
Circa 1990. Not sure if amused or bewildered that 33 years later I am typing these words on a linux computer. Back then I was using a Philips MSX, loading video games from tapes and using a text editor that could write and print one page at a time.