Cosmic Microwave Background
The cosmic microwave background map beside a kitchen microwave, whose fish smell lingers for 13 million seconds.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-05-15-cosmic-microwave-background/ (CC BY-NC 4.0)Transcript
[Left] "COSMIC MICROWAVE BACKGROUND — signature of the early universe, lingering 13 billion years later" (CMB map, labeled "Wikipedia")
[Right] "EARTHLY MICROWAVE BACKGROUND — signature of the one time you microwaved fish, lingering 13 million seconds later" (a microwave oven)