Robert Krulwich

Poor Johannes Kepler. One of the greatest astronomers ever, the man who figured out the laws of planetary motion, a genius, scholar and mathematician — in 1611, he needed a wife. The previous Mrs. Kepler had died of Hungarian spotted fever, so, with kids to raise and a household to manage, he decided to line up some candidates — but it wasn't going very well.

Look at this guy.

He is half-smiley, half-frowny. I drew the mouth carefully to make it equal parts sad and happy.

But when you look at him — take him in whole — would you say he's having a good day or a bad day?

Most people would say: good day. He seems a little more smiley than not.

That's because, says science writer Sam Kean, when we look at somebody, the left side of that person's face is more emotionally powerful and "determines the overall emotional tenor."

They don't have eyes. Or ears. Or what we would call a nervous system. But plants can talk. And they listen. Let me show you how.

First, we'll need a plant eater. This one's perfect: It's an aphid, a hungry little critter who loves to munch on fresh, green leaves ...

Next, we arrange lunch. We choose a bunch of young, healthy bean plants with lots of broad, green leaves ...

The U.S. and Canada may be as lovey-dovey as two neighbors can get, but according to this charming video history by CGP Grey, both countries agreed to tuck themselves a little bit in, 10 feet back for America, 10 feet back for Canada, creating a corridor of open, surveillable, clear space between them.

There is love. And then there's albatross love.

In his new book, The Thing With Feathers, Noah Strycker says albatrosses have a knack for coupling. "These globe trotters, who mate for life and are incredibly faithful to their partners, just might have the most intense love affairs of any animal on our planet," he writes.

How did it happen? How'd the zebra get its stripes?

In Rudyard Kipling's version, a gray, horsey-looking beast went into "a great forest 'sclusively full of trees and bushes and stripy, speckly, patchy-batchy shadows," stayed there awhile, and after a "long time"... got stripy.

OK. Not bad.

Shara Yurkiewicz is a med student. She's doing rounds now, moving from department to department. Much of what she sees, she's seeing for the first time. Not yet a doctor, there are moments, many moments when she has the eyes of a patient. She gets scared. She feels helpless. She's too involved. She's at that place in her training where everything is so sharp, so new, she feels the full, fresh stab of it, and sometimes, very privately, she bleeds.

This, I would think, should be self-evident: Generally speaking, big creatures eat smaller creatures that, in turn, eat even smaller creatures, like this ...

And just as obviously, one would expect the food chain to be pyramid-shaped: a few big creatures at the top eating more middle-sized creatures in the middle, that eat many, many, many little creatures at the bottom, like so:

Some people like a nice walk, some a gentle run, others a cup of tea. But not Andrew Ucles. There is nothing relaxed about Andrew. You can find him chasing after wild animals on his videos, grabbing them with his bare hands and then, while they squiggle, scratch and lunge, he tells them, "Settle, settle," shows them to the camera, brags a little and lets them go.

Two weeks ago this animal was frozen solid. If you found one in the woods, packed in the topsoil, hiding under a leaf, you could pull it from the ground and it would feel like an ashtray. You could bang it (lightly) on a table — it would go, "Konk!" like a rock. It doesn't seem to be breathing. It reacts to nothing. It's so dead. Or seems to be. And then, this (I want to call it a miracle) happens ...

This is the story of a totally made-up place that suddenly became real — and then, strangely, undid itself and became a fantasy again. Imagine Pinocchio becoming a real boy and then going back to being a puppet. That's what happened here — but this is a true story.

It's about a place in upstate New York called Agloe. You can see it here, circled in blue ...

... just up the road from Roscoe and Rockland.

Think of a rain forest — rich with trees, covered by clouds, wet all the time.

Then ask yourself, how did this rain forest get started?

I ask, because the answer is so going to surprise you. It's not what you think.

Until I saw the video you're about to see, I just figured that a rain forest starts when a place gets rainier. (Why it gets rainier, I don't know. I don't think about that.) And then — once it starts raining all the time — tropical, rain-loving trees start to grow. They grow everywhere, and make a forest.

A few years ago, physicist Brian Skinner asked himself: What are the odds I will die in the next year? He was 25. What got him wondering about this, I have no idea, but, hey, it's something everybody asks. When I can't wedge my dental floss between my two front teeth, I ask it, too. So Brian looked up the answer — there are tables for this kind of thing — and what he discovered is interesting. Very interesting. Even mysterious.