I once heard someone say that when we are doing exactly what God wants us to do, we get in a zone and everything falls into place miraculously.  I see that in my homeschool and rejoice that I am in God's plan for me sons' lives.  The other day I was reading them the book Fall of Lucifer by Wendy Alec.  In it was a part about the young angels discussing the density of the earth.  Later, I turned to our Story of Science: Newton at the Center textbook and began reading where I left off.  We were reading the story of Henry Cavendish and how he measured the density of the earth.  I couldn't believe how it all came together without my planning it.  I felt like I was in the zone . . .