To Do List... or lack thereof

During the day when I'm at work, or even after work when I'm out somewhere, I'll think to myself, This is really something I should learn more about, and then make a mental note to look it up on the internet later...

But of course, the second I get inside my residence building I forget all about it, even if I remember that there was something I wanted to remember.

:/ I need to start keeping a to-do list, for work and for personal reasons. I guess the closest thing I have would be my 43 things.