Robert Krulwich

So many nations are breaking up. Ukraine is in pieces. Moldova is teetering. Libya has no government to speak of. Sudan broke in two last year; now both sides are fighting. Yugoslavia is seven countries. Nigeria has a Christian/Muslim split. Syria has split so many ways it's barely there. Even Scotland is thinking of ditching Great Britain. With every break, we get new lines, new fences, new borders — further evidence of our failure to amalgamate, to get along.

The more borders we have, the more quarrels, the more wars. That's one way to think about borders — they're trouble.

Sometimes the quiet ones surprise us.

Take moss — those fuzzy green pads you see on the sides of old trees, or hanging onto rocks. Who notices moss? It's just ... there, doing whatever it does — so slowly, so terribly slowly, that nobody bothers to think about it. Moss creeps up tree bark, sits quietly on crevasses in rocks. Moss is an old, old life form, one of the earliest plants to attach to land around 450 million years ago. It's very patient, very modest — but when you look closely, you discover it has super powers.

Pow! Crunch! Zap!

This is a trick question. Where would you expect to find the greatest variety of birds?

Downtown, in a city?

Or far, far from downtown — in the fields, forests, mountains, where people are scarce?

Or in the suburbs? In backyards, lawns, parking lots and playing fields?

Not the city, right?

Editor's note: We've added an update at the bottom of this post with results of the auction. Read on!

It's a highly specialized category to be sure: "Longest." But that's what the auctioneer is selling. According to the catalog of I.M. Chait Gallery, in Beverly Hills, "This truly spectacular specimen is possibly the longest example of coprolite ever to be offered at auction."

Any eclipse is worth seeing. A total eclipse — where the moon completely blots out the sun, where day turns to night, where solar flares ring the moon's shadow like a crown of flame — that's the eclipse everybody wants to see, the alpha eclipse that eclipses all the other eclipses. Everybody knows this (me included), until I saw this ...