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Hey, Smarty Pants. As you can hear, I'm on the bus.

Next stop, Bridge Street.

I've only got a few more stops, but I sure am hungry.

Wait, what's this under my seat? Why, it's a baloney sandwich. Just sitting there.

Should I eat it? I am pretty hungry. What do you think?

Um, hopefully you said no. After all, there's no telling where this sandwich came from.

How it got there? Or how long it's been lying around?

Yuck! Oh, it's my stop. But I sure am hungry.

Hey, what about the berries on this bush? I could eat these, right?

I don't know if you should eat those, sunny. That man over there just tried some.

I feel sick. Yikes. Guess not. The birds seem to like them, but they're definitely not people,

food. Yo, K-Pow. I'm fine.

Throughout human history, people have determined what to eat. Yum.

And what not to eat.

Through a process called trial and error.

I think it was an error to eat those berries.

That led to learned behavior.

...