Conversation so far:
who is sheldon on big bang theory married to
In the 10th season finale, Sheldon unexpectedly proposes to Amy Fowler. In the eleventh season premiere, Amy accepts his proposal, and they marry in the season finale.
What happened after Sheldon and Amy married on The Big Bang Theory
Late in season 12, Amy is preparing Sheldon to accept them having children.
What happened to Sheldon and Amy in the series finale of The Big Bang Theory
In the series finale, both Sheldon and Amy are recipients of the Nobel Prize in physics.

Question: Why did they win the prize
Self-contained rewrite: Why did Sheldon and Amy win the Nobel Prize in physics on The Big Bang Theory