When a bunch of people get into an elevator, do they segregate in any predictable way? Do tall ones stand in the back? Do men stand in different places than women? Who looks where?

The images are sharp and concentrated. But this isn't art, it's more than advertising, and it's not quite education. It's an invitation.

The images are sharp and concentrated. But this isn't art, it's more than advertising, and it's not quite education. It's an invitation.

Humans see seven colors. Dogs see three. But which animal sees the most colors? It's a vicious undersea critter you'll want to know more about.

The Oatmeal

A few months ago on Radiolab, we did an hour on color, which included a segment on rainbow watching. We imagined a man, a dog, a sparrow and a butterfly all gazing at the same rainbow and we asked: How many colors does each see?

What if you put all 7 billion humans into one city, a city as dense as New York, with its towers and skyscrapers? How big would that 7 billion-sized city be? As big as New Jersey? Texas? Bigger? Are cities protecting wild spaces on the planet? We try a little experiment to find out.

What if you put all 7 billion humans into one city, a city as dense as New York, with its towers and skyscrapers? How big would that 7 billion-sized city be? As big as New Jersey? Texas? Bigger? Are cities protecting wild spaces on the planet? We try a little experiment to find out.

Monty Python's John Cleese gives us a highly sophisticated, totally un-understandable, look at the human brain. The secret is, Cleese isn't speaking English. It sounds like English, but its nonsense. The closed caption English translation goes nuts, especially at the very end. It curses!

Monty Python's John Cleese gives us a highly sophisticated, totally un-understandable, look at the human brain. The secret is, Cleese isn't speaking English. It sounds like English, but its nonsense. The closed caption English translation goes nuts, especially at the very end. It curses!

They call them Romance Pants, from Instructables.com, one of the world's premier do-it-yourself sites. They're for the Romantic Man who has overplanned (and overthought and overdone) his upcoming night of love. One 7805 voltage regulator required.

They call them Romance Pants, from Instructables.com, one of the world's premier do-it-yourself sites. They're for the Romantic Man who has overplanned (and overthought and overdone) his upcoming night of love. One 7805 voltage regulator required.

They're not locusts. They don't eat crops, don't sting babies to death, don't even harm fruit. Yes, they make loud, screechy noises, but if you were a female cicada, you'd find the love songs ... um ... lovely. Here come the cicadas!

They're not locusts. They don't eat crops, don't sting babies to death, don't even harm fruit. Yes, they make loud, screechy noises, but if you were a female cicada, you'd find the love songs ... um ... lovely. Here come the cicadas!

You probably know the feeling: You turn on your computer, decide to mosey around, but only for a minute or two, you have important things to do, and then — whooooosh! The computer sucks you in and you can't stop clicking. Why does this happen? Artist Dina Kelberman knows why. Let her trap you.

You probably know the feeling: You turn on your computer, decide to mosey around, but only for a minute or two, you have important things to do, and then — whooooosh! The computer sucks you in and you can't stop clicking. Why does this happen? Artist Dina Kelberman knows why. Let her trap you.

Some of the best science reporters, like the best Vaudevillians, the best circus performers, the best teachers, are hungry for attention — not for themselves, but for a way to seize your mind, to bring you to an idea, a puzzle, or a creature.

Some of the best science reporters, like the best Vaudevillians, the best circus performers, the best teachers, are hungry for attention — not for themselves, but for a way to seize your mind, to bring you to an idea, a puzzle, or a creature.

You don't expect fourth-graders to be wise. They're still boys. But one, who was playing and ruminating on his back patio, had a knack for cosmology seemingly well beyond his years.

You don't expect fourth-graders to be wise. They're still boys. But one, who was playing and ruminating on his back patio, had a knack for cosmology seemingly well beyond his years.

Krulwich Wonders will be back at the end of March.