Any time I’m teaching , especially if I’m teaching children, I always ask a trick question. And I tell them that it’s a trick question. I’ll hold up a magic marker and say, “can you all see this?” Of course they will nod or say “yes”. And I’ll say, “no you can’t see this. You can see the light bouncing off of this, but visually, you are not able to go to this object. The light has to come to you.” And I can prove it. If we come back here at midnight, and turn off all the lights and Read more »