Gates actually wrote about the photo in a blog post he wrote after Allen passed away. [1]
> The first time I saw how passionate Paul could get about something, I was in 8th grade. This picture might make you think he was my teacher, but he was actually a sophomore, just a little less than three years older than me.
> This teletype is the thing that brought us together. Our school, Lakeside, held a rummage sale and used the proceeds to buy a teletype terminal. We were obsessed with it. The problem was, it was really expensive to use – 40 dollars an hour! The only way for us to get computer time was by exploiting a bug in the system.
> The first time I saw how passionate Paul could get about something, I was in 8th grade. This picture might make you think he was my teacher, but he was actually a sophomore, just a little less than three years older than me.
> This teletype is the thing that brought us together. Our school, Lakeside, held a rummage sale and used the proceeds to buy a teletype terminal. We were obsessed with it. The problem was, it was really expensive to use – 40 dollars an hour! The only way for us to get computer time was by exploiting a bug in the system.
1. https://www.gatesnotes.com/Forbes-Philanthropy-Summit-honors...