```The termites morph OVER the bots -- we see both at the same
time, doing the same activities -- moving as a swarm. Their

CHARLIE (cont'd)
These bots employ info-taxis, a
spatial search algorithm in which
agents repeatedly update guesses of
an object's location.
```

# Garbage Collection by Ants »

Assume there are many tiny pieces of garbage scattered on a 2D square space, where many ants are wandering to forage randomly. Each ant individual behaves according to the following very simple rules when it comes to a place where there is some garbage. 1. If the ant is holding a piece of garbage, it drops it off there. 2. If the ant isn't holding any garbage, it picks up a piece of garbage there.
```
Charlie removes the leader bot.  The remaining bots stop,
rotate, then line up behind a new leader, go back to work.

CHARLIE
They figure out the next best leader,
and keep going.  Much more robust --
and cooperative -- in hostile
environments than people.
(indicating laptop screen)
Each bot creates a model of its local
environment, networks it, and we get
a collective picture.
```

# 3D Boid Model »

The Boid model is a famous multi-agent model that was invented by Craig Reynolds. Each Boid is an agent following three simple rules: (1) Align with other neighbors; (2) Try to be close to neighbors; (3) Avoid collision with other neighbors. These rules can make the flock of Boids reproduce the behaviors of real bird flocks or fish schools.
```                    CHARLIE (ON RADIO)
(realizing)
Dammit --
(to Colby)
Colby, are you counting in meters?

That's the problem -- I counted in
yards.  Let me backtrack, do it right.

DON
Go easy.

CHARLIE
Do you want the calculations in
yards?
```

# Length Units of Measurement »

Visualizing just how large a unit is can be difficult. Displayed here are a few real-world examples of the size of some units of measurement.