Original work edit
These are all diagrams and figures that I created myself.
Original photos edit
Pictures I've taken myself, that could be of use for relevant articles.
Derivative work edit
These are modifications I made to figures and photos that were already on Wikipedia or Wikimedia Commons.
Free licenses edit
Most of these I got from Flickr, and are available under Creative Commons licenses. Some come from the Cambridge Computer Laboratory Archive Photos website (also available under Creative Commons).
Public domain edit
These are in the public domain due to their age or due to being U.S. government works.