Physics

Today You Should Know answers your curious questions about how the world works. Here's everything we've covered (so far) on the topic of physics. Whether you're interested in why you feel more buoyant in salt water or how magnets work, there will definitely be something that satisfies your curiosity about how the world works.

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Why does a wooden spoon stop water from boiling over in a pot?
Why does a wooden spoon stop water from boiling over in a pot?

A penne saved is a penne earned.

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How do noise-cancelling headphones work?
How do noise-cancelling headphones work?

Let's make some noise for noise cancellation

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How do birds navigate during migration?
How do birds navigate during migration?

I think we can rule out Google Maps.

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Why does the sky turn pink at sunset?
Why does the sky turn pink at sunset?

Don't miss the science behind nature's best Instagram filter.

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Why does electricity make noise?
Why does electricity make noise?

Discover the electrifying reason why AC/DC isn't just a legendary rock band.

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Why are you more buoyant in salt water?
Why are you more buoyant in salt water?

While you may feel weightless, I assure you, you are not.

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Why is it easier to balance a bike in motion?
Why is it easier to balance a bike in motion?

It’s easier to ride a bike than to understand why it’s easy to ride a bike.

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How does siphoning work?
How does siphoning work?

Please don’t cite this when you go to steal gasoline.

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How does your phone track steps?
How does your phone track steps?

I’ll walk you through it step-by-step.

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How does carbon dating work?
How does carbon dating work?

Swipe right for science.

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Why is the ocean blue if water is clear?
Why is the ocean blue if water is clear?

I promise this isn't the start to a riddle

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What causes the Earth to spin?
What causes the Earth to spin?

The original spin move.

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How do magnets work?
How do magnets work?

Get ready for a refresher on electrons!

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How do gas pumps know when to stop pumping?
How do gas pumps know when to stop pumping?

I hope you’re feeling pumped for some physics!

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Why do candles smoke when blown out?
Why do candles smoke when blown out?

What if I told you the smoke is actually vaporized wax?

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Why do trains make a screeching noise?
Why do trains make a screeching noise?

Chugga-chugga-choo-screech

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What is quantum entanglement?
What is quantum entanglement?

I can’t explain it in this blurb.

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How are magnets manufactured?
How are magnets manufactured?

It takes a powerful magnet to make lots of other magnets.

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Why does helium make your voice higher?
Why does helium make your voice higher?

Read this one in a chipmunk voice.

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What is a black hole?
What is a black hole?

Chances are it’s probably not a wormhole.

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What does E=mc² mean?
What does E=mc² mean?

Mass is energy. Energy is mass.

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How does lightning work?
How does lightning work?

The answer might shock you.

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Why does the wind blow?
Why does the wind blow?

From gusts to breezes and everything in between, it primarily comes down to temperature.

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