Robert Krulwich

Ah, if only all summers could be like June, July and August 1740 — when three young guys (and a 6-year-old and a 3-year-old) did a science experiment that startled the world. In those days, you could do biology without a fancy diploma. More people could play.

Solved! A bee-buzzing, honey-licking 2,000-year-old mystery that begins here, with this beehive. Look at the honeycomb in the photo and ask yourself: (I know you've been wondering this all your life, but have been too shy to ask out loud ... ) Why is every cell in this honeycomb a hexagon?

Bees, after all, could build honeycombs from rectangles or squares or triangles ...

But for some reason, bees choose hexagons. Always hexagons.

A few nights ago, (Wednesday, I think, around midnight), I was by my window looking up, and there, hanging in the sky, I saw the moon. Not all of it, just what the almanac used to call "a crescent" — what my mom called a "toenail moon." The whole moon, I knew, was up there, hidden in shadow. The crescent part was facing the sun. That's the part you can see at the beginning of each month, my second grade teacher, Mrs. Elkins taught us, using a flashlight and a tennis ball to demonstrate the phases of the moon. Scotty Miller, I remember, got to hold the tennis ball. Mrs.

What would it be like to be a string that made music? Not anything simple, like a guitar string or a cello string, but a magical string, a sine curve that's taut then loose, that doubles then doubles again, that sheds then dissolves into showers of notes — a flaming, sighing, looping, dissolving string. Curious?

What you are about to see — and I'm not making this up — is a moth driving a car.

Some things you just count on. Like if we ever meet a space alien, it should have eyes (and maybe a head). Like somewhere out there, there are planets like ours. Like we have an ordinary solar system — "ordinary" because you know what it looks like ...

It's got a sun in the middle, little planets on the inside, bigger ones farther out. That's what most of them should look like, no?