Ah, Kindergarten: literally, a “children’s garden.” Those were simple times. Backpacks. Lunch pails. Line leaders. Cupcakes for the teacher.

Saturday, April 21 marks the birthday of Friedrich Fröbel, who invented Kingergarten as a space to provide for the development needs specific to young children.

Kindergarten teacher Cathie Kerr works with her students in Michigan. (Daniel Mears/AP)

We’ll include some of our favorites on washingtonpost.com.