If you cut down a 40-foot (12-meter) Norway maple to a height of 6 to 10 feet (about 2 meters) and you build a platform on the stump (either on the cut trunk or just above where the trunk branches in...
My son, who is 8, was looking at a piece of salmon and asked: Why do fish have tiny little bones? I told him that their skeletons don't have to hold them up against the force of gravity. He said...
Is it true that the larger the size of the molecules, the more viscous the substance? (Original version of question, asked by my son: Why is water liquid and not gooey?)
My seven-year-old says, "There's water in everything, right, even in the desert sands? Is there water in this plastic? In this cookie? In your glasses?" I said yes to desert sands; I...