This poster is making the rounds on Reddit today:

As you might have guessed, it’s not actually from the Smithsonian (though it should be), but checking the Reddit thread, the original source is a student art project by designer Jenny Burrows. You can find a blog post about it, including two more posters in the same style, here. Prints are available from DeviantArt, and I sincerely hope some teachers buy them because they are awesome.