Welcome to the Things You Should Know Gallery Index. Below are the images from videos created on or after December 7, 2022. To give as much credit as we can (and beyond the base educational fair use requirements), we will attempt over time to remaster the older videos to update errors and give credit for all photos used. Each photo in these galleries will have all the available information in the individual photo view itself.
It should be known that most of the imagery involves events longer than 100 years ago and in general is free to use without the fair use doctrine. We will not go back to old photos that cannot be easily cited, but we will update those we can, when we can.