For the Charlotte Mason fan in me, I love that these units also incorporate studies of artists and their works, composers and their works, and poetry. Toss in some Bible and geography and you have a well-rounded, science-based unit study. Oh, how this makes me happy.
Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? ~Matthew 6:26