It's a paperclip compass.

Compass.

Distance also plays a role. Think back to playing with a magnet.

JH Now is this electromagnetic here, or are these static?

We have to generate an electromagnetic field...

I need a compass.

Compass needles point to the north.

This is a large pulley made by sandwiching rubber between two old CDs.

No compass?

A magnet attracts iron.

This is a horseshoe magnet.

JH I agree.

In other words, the field of the magnet is near the pigeon's head.

The magnets, of course, have a magnetic field around them.

And the closer they are, the stronger the attraction.

Whenever current flows through the coil, this becomes an electromagnet.

You can see, this is the generator. It's a crank generator.

Charles Walcot investigated the magnetic compass bearing sense in pigeons.

This is a picture about a year ago.

I have here a superconductor, which I wrapped up so it'd stay cold long enough.

It includes 330 compasses.

Therefore it has a smaller gravitational pull on the astronaut.

Now this is important for two reasons.

I've got some pieces of notebook paper folded up into a rough Z shape.

It's a remarkable effect. It's very strong.

If you float a one yen coin on water and move a magnet slowly towards it then the coin will approach the magnet.

Keeton put magnets on the heads of his pigeons.

The magnets on their heads were responsible for that.

Maybe one more thing might help. Have you ever played with two magnets?

You know, the magnets with the north and the south poles?

This is a permanent magnet.

In order to get through that, we have to generate an electromagnetic field.

All right, in order to get through that, we have to generate an electromagnetic field...

To have an electromagnetic field with the force that we want, we're gonna need at least a couple of car batteries.

Now that's more impressive when you consider those magnets weigh over 20 tons, and they moved about a foot.

So I'm sure all you engineers know that even though aluminum is a metal, it's not a magnetic material.

As you're seeing this gel magnet for the first time, if you assume that all magnets had to be hard, then seeing this surprised you and it changed your understanding of the way magnets could work.

But where is this compass?

These are these arrays.

Each of the red dots are where a protein has actually been identified.

It's got bumps on the back of its wing covers.

We had to take them out, which we did.

They aren't as attracted to each other.

y ou can tell your foiks. it's on ebay. i take paypal.

When you take the magnets and put them closer to each other, they move together.