0
Skip to Content
Today You Should Know
👋 About
📝 Articles
🫁 Anatomy
🌌 Astronomy
🦠 Biology
🧪 Chemistry
🎭 Culture
🔧 Engineering
🍟 Food & Drink
📜 History
✍️ Language
🧵 Life Skills
🧮 Math
🎹 Music
🧲 Physics
🧠 Psychology
🏛️ Public Policy
⚙️ Technology
🐋 Zoology
All Articles
📚 Book Recs
🥗 9 Books about Health & Well-being
🤔 18 Books about Things You Might Not Know
👨‍👩‍👧‍👦 15 Books about Interesting People
🏛️ 7 Books about the Present
🌞 10 Books about the Past
🚀 2 Books about the Future
All Book Recommendations
🤔 Submit a Question
🦄 Weird Wikipedia
Subscribe
Today You Should Know
👋 About
📝 Articles
🫁 Anatomy
🌌 Astronomy
🦠 Biology
🧪 Chemistry
🎭 Culture
🔧 Engineering
🍟 Food & Drink
📜 History
✍️ Language
🧵 Life Skills
🧮 Math
🎹 Music
🧲 Physics
🧠 Psychology
🏛️ Public Policy
⚙️ Technology
🐋 Zoology
All Articles
📚 Book Recs
🥗 9 Books about Health & Well-being
🤔 18 Books about Things You Might Not Know
👨‍👩‍👧‍👦 15 Books about Interesting People
🏛️ 7 Books about the Present
🌞 10 Books about the Past
🚀 2 Books about the Future
All Book Recommendations
🤔 Submit a Question
🦄 Weird Wikipedia
Subscribe
👋 About
Folder: 📝 Articles
Back
🫁 Anatomy
🌌 Astronomy
🦠 Biology
🧪 Chemistry
🎭 Culture
🔧 Engineering
🍟 Food & Drink
📜 History
✍️ Language
🧵 Life Skills
🧮 Math
🎹 Music
🧲 Physics
🧠 Psychology
🏛️ Public Policy
⚙️ Technology
🐋 Zoology
All Articles
Folder: 📚 Book Recs
Back
🥗 9 Books about Health & Well-being
🤔 18 Books about Things You Might Not Know
👨‍👩‍👧‍👦 15 Books about Interesting People
🏛️ 7 Books about the Present
🌞 10 Books about the Past
🚀 2 Books about the Future
All Book Recommendations
🤔 Submit a Question
🦄 Weird Wikipedia
Subscribe
How does a caterpillar change into a butterfly​?
Zoology, Biology Caitlin Olson 4/10/25 Zoology, Biology Caitlin Olson 4/10/25

How does a caterpillar change into a butterfly​?

Pokémon sound effects sold separately

Read More
How do laser pointers work?
Physics, Technology Caitlin Olson 4/3/25 Physics, Technology Caitlin Olson 4/3/25

How do laser pointers work?

Your dog or cat may be wondering...

Read More
What makes you feel full when you're eating?
Anatomy, Food & Drink Caitlin Olson 3/27/25 Anatomy, Food & Drink Caitlin Olson 3/27/25

What makes you feel full when you're eating?

Are you hungry for a human anatomy lesson?

Read More
Why does plastic turn yellow?
Chemistry, Physics Caitlin Olson 3/20/25 Chemistry, Physics Caitlin Olson 3/20/25

Why does plastic turn yellow?

We've cracked this polymer-der mystery

Read More
Why are hot dogs called hot dogs?
Food & Drink, Language, History Caitlin Olson 3/13/25 Food & Drink, Language, History Caitlin Olson 3/13/25

Why are hot dogs called hot dogs?

Let me be frank(furter).

Read More
Why does your voice sound different on a recording​?
Anatomy, Physics, Psychology Caitlin Olson 3/6/25 Anatomy, Physics, Psychology Caitlin Olson 3/6/25

Why does your voice sound different on a recording​?

Hear me out — your ears are deceiving you

Read More
Why can't chickens fly?
Policy, Zoology Caitlin Olson 2/27/25 Policy, Zoology Caitlin Olson 2/27/25

Why can't chickens fly?

It’s a little clucked up.

Read More
Why does traveling make you tired?
Anatomy, Physics Caitlin Olson 2/20/25 Anatomy, Physics Caitlin Olson 2/20/25

Why does traveling make you tired?

Going from point A to point Zzzzzzz

Read More
What causes the "butterflies in your stomach" feeling?
Anatomy Caitlin Olson 2/13/25 Anatomy Caitlin Olson 2/13/25

What causes the "butterflies in your stomach" feeling?

Fight, flight… or flirt?

Read More
Why do paper cuts hurt so much?
Anatomy, Physics Caitlin Olson 2/6/25 Anatomy, Physics Caitlin Olson 2/6/25

Why do paper cuts hurt so much?

Don’t worry. You're safe if you didn't print this article.

Read More
How does the birthday paradox work?
Math Caitlin Olson 1/30/25 Math Caitlin Olson 1/30/25

How does the birthday paradox work?

🎵 Happy birthday to you … and you too 🎵

Read More
How does superglue work?
Chemistry, Life Skills Caitlin Olson 1/23/25 Chemistry, Life Skills Caitlin Olson 1/23/25

How does superglue work?

It’s super cool.

Read More
Why are people ticklish?
Anatomy Caitlin Olson 1/16/25 Anatomy Caitlin Olson 1/16/25

Why are people ticklish?

And why are others immune?

Read More
How do clouds float?
Physics Caitlin Olson 1/9/25 Physics Caitlin Olson 1/9/25

How do clouds float?

You'll be on cloud nine after you learn this

Read More
Why do some flowers bloom in the winter?
Biology Caitlin Olson 1/2/25 Biology Caitlin Olson 1/2/25

Why do some flowers bloom in the winter?

The weather outside is frightful? Not to these plants.

Read More
Why is New Year's Day on January 1?
History Caitlin Olson 12/26/24 History Caitlin Olson 12/26/24

Why is New Year's Day on January 1?

More like Ja-new-ary 🥁

Read More
Why do you feel sore the day after a workout?
Anatomy Caitlin Olson 12/19/24 Anatomy Caitlin Olson 12/19/24

Why do you feel sore the day after a workout?

I think we’ve all done the Post-Workout Waddle Walk

Read More
Why are there so many Union Stations in America?
History Caitlin Olson 12/12/24 History Caitlin Olson 12/12/24

Why are there so many Union Stations in America?

It’s not because Americans lack creativity

Read More
How does Drano work?
Life Skills, Chemistry Caitlin Olson 12/5/24 Life Skills, Chemistry Caitlin Olson 12/5/24

How does Drano work?

🔥 + 🫧 = 🚰

Read More
Are there more people alive today than have ever lived?
History, Math Caitlin Olson 11/28/24 History, Math Caitlin Olson 11/28/24

Are there more people alive today than have ever lived?

Even though it might seem like it on your crowded commute…

Read More
Newer Posts
Older Posts
GIF of Past Newsletter Articles

Curious about how the world works?

Today You Should Know is a free weekly email newsletter designed to help you learn something new every Friday in 5 minutes or less.

Subscribe today 👇

Today You Should Know is a labor of love by Caitlin.

Learn five facts about Caitlin.

Caitlin

Recent Articles

About

Book Recommendations

Privacy Policy