That was big business — almost the only way the settlers had of getting cash money.

This is a warning sign.

This is a great place to get the kids acquainted with how things work.

The wet zone is a great place to find food. There's a game going on here. The game is to find food without becoming food. A lot will become food, a lot will be healthily fed.

Tiny plants in water get a burst of energy from the nutrients.

The tongue is used to smell and touch.