this really awesome machine for us to look at.

(SciGirls) Cool!

Look at this!

(Angela) When the ice-cream trike came out, I was super like, amazed, 'cause it wasn't at all what I was expecting.

It was such a good thing for me to see; just how big that barrel was!

Basically how this thing works is the pulley is here, it's attached to this groove here by the wheel, the wheel turns, the pulley comes up, and makes this whole system here turn, and then in turn, that makes this whole area here, makes the ice-cream maker turn around.

See, it's attached here, and that churns the ice cream.

Pretty surprised by the setup; I hadn't thought about attaching it to the wheel.

(Rebecca) I really like how the mechanical energy of just like, the turning on the bike got translated into the churning of the ice cream.

(Angela) Becca, how does it feel?

(Rebecca) It's pretty cool.

(Angela) How's changing the gears?

(Rebecca) I've never changed a gear in my life.

(Margaret) The fact that you couldn't really steer it first was a big problem.

It was pretty slow; I mean, we even rode in the pedestrian lane, and it got faster, but still, it wasn't really fast.

Kind of, it isn't like normal bike so it's perfectly balanced, but once you find kind of the equal, which is leaning more towards the left, it works really well.

Wait, wait, wait, let me... stuck.

It's like, stuck.

It's jammed.

Oh yeah, that's what happened.

(Margaret) The rubber tube they used to churn the ice cream, that kept getting caught in the wheel.

If we use one of these on our bike, we want to make sure that doesn't happen.Exactly.

The ice cream trike was kind of like steering a horse.

Whoops!

Sorry.

Where am I going?

Angela!

Where am I going?

Start on the path, then you go round and round in circles, because it always wanted to lean to the right.

It does pull to the right a little bit, so that's why; it's not you.

Try not to run over any small dogs either.

(Amber) We got this Angela.

(Olivia) She hasn't run into anything yet!

[SciGirls laugh; Angela screams] Well, gotta stop!

That's the thing, it's like, awkward.

Maybe building a bigger ice-cream machine isn't the best idea.

Like, maybe having an ice-cream machine that's easier to balance on 2 wheels is better.

Yeah.

Obviously we're doing 2 wheels.