"The math will probably be more useful after I have an intuition."

"Quite likely. So, where to next? Sure you don't want to see the multiverse a bit before settling down? There's a planet with a thousand species of flowering tree, and every three thousand years they all bloom at once."

"That does sound pretty."

"Absolutely stunning." She seems to have taken this statement as acceptance, because she starts pulling levers on the dashboard again. "You might want to find something to hold on to."

...Promise looks for suitable handholds.

There are railings along the walls. There are also the traditional benches and seatbelts, including one with a back that looks like it wouldn't squash her wings much.

She grabs a railing.

"Alright Bus, do your stuff!" Ms. Frizzle pulls a final lever and the view out the window gets all weird again. Now they're in a different forest, where it's just after dawn and the sky and the trees are both overflowing with color.

...Promise tiptoes over to the window to get a closer look.

She can't see all one thousand kinds of trees at once from this vantage point, but she can see multiple dozens--clusters of tiny red ones and single enormous blue ones, purple ones fading to white at the center, yellow ones whose petals are foot-long streamers fluttering gently in the breeze. Some of the flowers are growing directly out of the tree trunks; some sprout up from the roots to cover the ground with veins of color. Some are translucent. Some are luminescent. A shaft of sunlight hits a branch and all the buds on it unfold at once in a matter of seconds.

"Ee!"

Ms. Frizzle smiles at her, pops the door, steps out, and twirls exuberantly. Her dress has switched to a pattern of flowers and fruit. 

Tiny gem-bright insects, and clouds of hand-size butterflies, and little darting birds are roving between the trees, feasting on nectar.

"What are those things -"

Ms. Frizzle is So Excited about having been asked a question!

"Those birds and insects are pollinators! They drink nectar from the flowers, and they spread pollen which help the trees reproduce! If you like, we can shrink down and take a look at the process up close!"

"Fairyland doesn't have animals," explains Promise. "They're kind of weird. You can shrink?"

"What, none at all? That must have fascinating consequences for your ecology. Do you have fungi? Microbes? Do fairies pollinate plants? And oh, yes, the Bus has a shrinkerscope that can make us anywhere between full-size and microscopic!"

"We have fungi and I don't know about microbes and sometimes fairies pollinate plants."

"Do dead plants decay, or get diseases that aren't in the form of fungi or parasites? Do fairies get diseases? "

"Dead plants decay eventually, but I'm not sure what causes all their problems so it could all be fungi or parasites. Fairies don't get sick."

"Then it's entirely possible you don't have native microbes! Though I expect some will have colonized off outsiders arriving. So, what do you say, shall we go explore the insides of some flowers?"

"Yeah, all right."

"Excellent! Here we go!" Rays of light shines out of each of the Bus's headlamps and illuminate the two of them. They start getting smaller; it doesn't feel like anything and looks like their surroundings getting bigger. "Wahoo!" yodels Ms. Frizzle as they shrink to about a centimeter tall.

Promise wonders if this will make flying easier. Flutter flutter.

Her mass has decreased by a greater fraction than the surface area of her wings, so she doesn't need to flap as hard to get lift!

Ms Frizzle, for her part, has pulled a jetpack out of a pocket that should not be able to fit a jetpack and strapped it on. She joins Promise in the air.