Translation: The word cool can have many meanings to humans. Depending on how it is used, something that is cool can be cold (like a snowflake) or exciting (“That’s so cool!”). A human might say “Cool it” (if they want you to stop) or “You look cool!” (if you are wearing fashionable sunglasses). And if you happen to be holding an ice cream, a human might think that is cool for multiple reasons (it is both cold and exciting).

My vocabulary drive flickered with other possible uses. Cool down. Cool off. Cool your jets. Lose your cool. Play it cool. It is cool with me. Be cool. Cool as a cucumber.

One word.

Many meanings.

It seemed to me that humans treated their language like they once treated their fingernails. They enjoyed decorating and polishing their words. They gave every sentence a manicure.

Emma hopped out of Ceeron’s backpack. Her eyes widened as she stared at the view. A wilderness of rolling green hills. A stream meandering between patches of trees. The morning sky.

“Wow.” She caught her breath. “In the bunker, we had this old book of nature photographs. I used to flip through it all the time trying to imagine what the world was like aboveground. I stared at the pictures for hours. I basically memorized every page.”

“And?” Ceeron asked. “Is it like what you imagined?”

She shook her head. “This is so much . . . more.”

“More of what?”

“Of everything,” she said.

Emma placed her hand on the trunk of a tree, tracing her fingertip over the uneven bark. Her gaze drifted upward. A breeze whispered through the tree’s branches.

A single leaf detached and fell. As it twirled through the air, I tried to decode the pattern of its movements, to find the hidden algorithm within the looping and whirling. But nature is not programmed this way. The leaf followed its own mysterious path. Drifting down/down/down.

Until . . .

It landed at Emma’s feet.

Crouching close to the ground, she plucked the leaf by its stem and twirled it. Clockwise, then counterclockwise. She let out a soft laugh, her face full of wonder.

I watched Emma watching the leaf and a question formed in my mind.

What is she thinking?

I did not know. Just as I did not know why humans used the same word for cold, exciting, stop, and fashionable.

Sometimes, the human brain was as mysterious as a falling leaf.

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The world was not made for machines.

When it rains, water tries to sneak through our joints and ruin our circuitry. During dry periods, sand clings to our metal bodies, rubbing away our smooth surfaces, creating cracks and imperfections.

The ground is annoyingly irregular. Even the tiniest bump or dip can trip us if we are not careful.

Unpredictable clouds come along and cast shade over our solar panels.

The world really can be quite a nuisance sometimes.