I WAS on a farm with my grandson, Jimmy, letting him have a few shots with a .22, when we stopped at a shady pond for a rest. He sat gazing at the water’s still surface, then asked, “Grandpa, how come that insect can walk on water without sinking?” “It’s because water forms a sort of skin on top, and the insect is light enough not to break through it.” “But, Grandpa, it’s all the same water; there’s no skin on top.”
“Well, it’s complicated. Have you learned at school what atoms are?” “Yes, everything is made of atoms – they’re the tiniest parts of anything.” “And molecules?” “Uhm… they’re also tiny parts of stuff.” “Okay, when atoms bond together they form molecules, creating different substances. When two hydrogen atoms…
