Lettuce, 2 day germination

I started these lettuce on Friday morning prior to heading out to work. They are in 3/4" soil blocks within a small plastic storage bin (with a hinged cover). I noticed activity Friday evening, the smallest inkling of germination - some seed coverings had opened and tendrils emerged. Most of them are well on their way this morning.

The closed environment (the closed lid) must be the cause. The seeds, once moistened, didn't dry out. The temperature was also constant. In reading Steve Solomon, he states that this is the best way to get consistent and rapid germination. I certainly believe it now.

As a side note, the seeds were not covered in any fashion. Most seeds, especially vegetable seeds, do not require darkness to germinate. Covering serves to maintain moisture consistency.