The four most common chemically active elements in the universe - hydrogen, oxygen, carbon, and nitrogen - are the four most common elements of life on Earth. We are not simply in the universe. The universe is in us.
I think thats a good idea! Regarding if someone actually have done the lesson, you could include a tick box besides each lesson in the list of courses . So when the the lesson is done, we can indicate that in the list. / Jan Holm
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