Here’s a wild one: lettuce is actually a member of the daisy family. Yeah, those humble leaves are cousins of sunflowers and dandelions. So when you successfully sprout a seed, you’re technically growing a tiny, edible daisy. Take a bow.
Lettuce Germination at Harry Brawner blog
Also, each seed has a built-in timer. Lettuce seeds remain viable for about 2-3 years, but after that, they give up on life. If you’re using last decade’s seeds, don’t. Throw them out. Let them find peace in a compost heap.