Soybeans
Note: This is my farm-girl, got-a-degree-in-ag-economics description of what happens. If you want to hear the technical stuff from the experts, this is a good place to start! Otherwise, keep scrolling for pretty pictures and the common-folk explanation. :)
First, the soybean sprouts and pushes the bean out of the ground! 
I've seen these babies push through drought-crusted soil, layers of corn stalks and cover crop residue. Truly amazing. 
You can actually look into the crack of the splitting bean and see little leaves in there. In fact, the bean shape you see poking out of the ground will form the first two leaves of the plant! 
Another photo - because it's just really cool to see! 
After the first two sets of leaves are developed, the plant will start unrolling leaves in sets of three! More on that later...
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