or lower pitch than the wood block.

[bucket clangs] - Oh, hey, kids.

Did the oven timer just ping?

I'’m making horseradish soufflé .

- No, Dad, it was Sean'’s experiment.

- I thought it was the oven timer.

Are you sure?

- Did it sound like this?

[bucket clangs] - Aha.

There it is again.

I'’d better go get the soufflé.

Oh, by the way, what'’s this experiment about?

- It'’s about sound.

- That'’s why we need total silence.

- [whispering] Got ya.

Carry on, then.

Uh, wait a sec.

How can you learn about sound in silence?

If you want my suggestion-- - Thanks, Dad, but-- - I know, I know, total silence.

Shh.

- [sighs] Sorry about that, Sean.

Go again?

- Okay, now I'’ll test these two objects to see which is a higher sound.

[low-pitched tapping] - Oh, did you kids hear the door just now?

I'’m expecting a package delivery.

- No, that was us, Mom.

We'’re doing an experiment.

- Oh, well, don'’t let me disturb you.

I'’ll be waiting for my package in the other room.

- I'’m guessing if we make the knocking sound again, she'’ll come right back.

- No, I won'’t.

- Okay.

[taps] - Uh-oh.

both: Oh, ooh.

Ooh, ugh.

- Celery?

What are you doing here?

- Carrot?

What are you doing here?

- Oh, I was just making sure no one interrupted Sean'’s experiment.

- Oh, how thoughtful of you.

Me too.

- How thoughtful of you.

- You'’re the greatest.

- No, you are.

[both sigh] - Shall we go outside?

- Please.

- [sighs]