(music plays)

In animation, a shooting star flies in space past planet Earth as a title appears: I wonder... WHY?

A girl pops up on screen. She has long black hair. Her name is Shreya.

Shreya says MY NAME IS SHREYA,
AND I WONDER WHY
OIL AND WATER
DO NOT MIX?

Damian Pope appears on screen. He is a perimeter scientist.

Damian says THANKS FOR YOUR
QUESTION, SHREYA.
NOW, IMAGINE A
GLASS OF WATER.

A glass of water appears on the screen.

Damian says IT'S FILLED WITH
MILLIONS AND MILLIONS
OF TINY BITS OF WATER
CALLED MOLECULES.
THESE WATER MOLECULES
ARE ALL THE SAME SHAPE.
THEY'RE KIND
OF V-SHAPED.
BECAUSE THEY'RE ALL
THE SAME SHAPE,
THEY'RE KIND OF LOCKED
TOGETHER TIGHTLY,
LIKE IDENTICAL JIGSAW
PUZZLE PIECES
THAT ALL GO TOGETHER.
LET'S ADD SOME
OIL TO THE WATER.
OIL IS MADE OF VERY
DIFFERENTLY SHAPED MOLECULES.
THEY'RE MUCH LONGER.
THEY ALL FIT TOGETHER
WELL WITH EACH OTHER,
BUT THEY JUST DON'T
FIT TOGETHER
WITH THE WATER
PARTICLES.
THEY'RE JUST TOO
DIFFERENTLY SHAPED.
AND THAT'S WHY OIL
AND WATER DON'T MIX.

In animation, tiny V-shaped water molecules bounce off long complex oil molecules.