Here is a Cultural Literacy worksheet on the Grand Unified Theory of the origins of the universe, specifically the first fraction of a second after the Big Bang. This is a half-page worksheet with a three-sentence reading and three comprehension questions.
This isn’t really my bailiwick, but I do understand that, as the reading concludes, that the Grand Unified theory “…explains the lack of antimatter in the universe.”
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.