First, a collection of rare Waterson ephemera;

Second, science education from Calvin’s dad; here’s some samples:

Calvin: Why do my eyes shut when I sneeze?
Dad: If your lids weren’t closed, the force of the explosion would blow your eyeballs out and stretch the optic nerve, so your eyes would flop around and you’d have to point them with your hands to see anything.

Calvin: How do bank machines work?
Dad: Well, let’s say you want 25 dollars. You punch in the amount and behind the machine there’s a guy with a printing press who makes the money and sticks it out this slot.
Calvin: Sort of like the guy who lives up in our garage and opens the door?
Dad: Exactly.

Calvin: What causes the wind?
Dad: Trees sneezing.

Calvin: Why does ice float?
Dad: Because it’s cold. Ice wants to get warm, so it goes to the top of liquids to be nearer to the sun.

Calvin: How do they know the load limit on bridges, Dad?
Dad: They drive bigger and bigger trucks over the bridge until it breaks. Then they weigh the last truck and rebuild the bridge.

Calvin: Dad, how come old photographs are always black and white? Didn’t they have color film back then?
Dad: Sure they did. In fact, those old photographs ARE in color. It’s just the WORLD was black and white then.
Calvin: Really?
Dad: Yep. The world didn’t turn color until sometime in the 1930s, and it was pretty grainy color for a while, too.
Calvin: That’s really weird.
Dad: Well, truth is stranger than fiction.
Calvin: But then why are old PAINTINGS in color?! If the world was black and white, wouldn’t artists have painted it that way?
Dad: Not necessarily. A lot of great artists were insane.
Calvin: But… but how could they have painted in color anyway? Wouldn’t their paints have been shades of gray back then?
Dad: Of course, but they turned colors like everything else in the ’30s.
Calvin: So why didn’t old black and white photos turn color too?
Dad: Because they were color pictures of black and white, remember?

Calvin: Dad, will you explain the theory of relativity to me? I don’t understand why time goes slower at greater speed.
Dad: It’s because you keep changing time zones. See, if you fly to California, you gain three hours on a five-hour flight, right? So if you go at the speed of light, you gain MORE time, because it doesn’t take as long to get there. Of course, the theory of relativity only works if you’re going west.