How can an infant be busy?

If you have ever asked this question, or have even considered it as a legitimate question, then you don't know one thing about infants. OK, maybe you know some things!
The truth is that infants have the busiest lives of all people. This is because even the simplest thing is a big project for us. Small tasks like grasping our mom's hand or saying a single word take forever. But we are optimitic and persevering creatures by design.
Oh, did I tell you that I have finally succeeded in thumb-sucking. No longer any funny fist-sucking! This happened about two weeks ago. And did I tell you that I don't like pacifiers at all? My parents offered it to me, and keep doing so, probably as a good-will gesture, but I prefer my own thumb.