0
Skip to Content
Today You Should Know
๐Ÿ‘‹ About
๐Ÿ“ Articles
๐Ÿซ Anatomy
๐ŸŒŒ Astronomy
๐Ÿฆ  Biology
๐Ÿงช Chemistry
๐ŸŽญ Culture
๐Ÿ”ง Engineering
๐ŸŸ Food & Drink
๐Ÿ“œ History
โœ๏ธ Language
๐Ÿงต Life Skills
๐Ÿงฎ Math
๐ŸŽน Music
๐Ÿงฒ Physics
๐Ÿง  Psychology
๐Ÿ›๏ธ Public Policy
โš™๏ธ Technology
๐Ÿ‹ Zoology
All Articles
๐Ÿ“š Book Recs
๐Ÿฅ— 9 Books about Health & Well-being
๐Ÿค” 18 Books about Things You Might Not Know
๐Ÿ‘จโ€๐Ÿ‘ฉโ€๐Ÿ‘งโ€๐Ÿ‘ฆ 15 Books about Interesting People
๐Ÿ›๏ธ 7 Books about the Present
๐ŸŒž 10 Books about the Past
๐Ÿš€ 2 Books about the Future
All Book Recommendations
๐Ÿค” Submit a Question
๐Ÿฆ„ Weird Wikipedia
Subscribe
Today You Should Know
๐Ÿ‘‹ About
๐Ÿ“ Articles
๐Ÿซ Anatomy
๐ŸŒŒ Astronomy
๐Ÿฆ  Biology
๐Ÿงช Chemistry
๐ŸŽญ Culture
๐Ÿ”ง Engineering
๐ŸŸ Food & Drink
๐Ÿ“œ History
โœ๏ธ Language
๐Ÿงต Life Skills
๐Ÿงฎ Math
๐ŸŽน Music
๐Ÿงฒ Physics
๐Ÿง  Psychology
๐Ÿ›๏ธ Public Policy
โš™๏ธ Technology
๐Ÿ‹ Zoology
All Articles
๐Ÿ“š Book Recs
๐Ÿฅ— 9 Books about Health & Well-being
๐Ÿค” 18 Books about Things You Might Not Know
๐Ÿ‘จโ€๐Ÿ‘ฉโ€๐Ÿ‘งโ€๐Ÿ‘ฆ 15 Books about Interesting People
๐Ÿ›๏ธ 7 Books about the Present
๐ŸŒž 10 Books about the Past
๐Ÿš€ 2 Books about the Future
All Book Recommendations
๐Ÿค” Submit a Question
๐Ÿฆ„ Weird Wikipedia
Subscribe
๐Ÿ‘‹ About
Folder: ๐Ÿ“ Articles
Back
๐Ÿซ Anatomy
๐ŸŒŒ Astronomy
๐Ÿฆ  Biology
๐Ÿงช Chemistry
๐ŸŽญ Culture
๐Ÿ”ง Engineering
๐ŸŸ Food & Drink
๐Ÿ“œ History
โœ๏ธ Language
๐Ÿงต Life Skills
๐Ÿงฎ Math
๐ŸŽน Music
๐Ÿงฒ Physics
๐Ÿง  Psychology
๐Ÿ›๏ธ Public Policy
โš™๏ธ Technology
๐Ÿ‹ Zoology
All Articles
Folder: ๐Ÿ“š Book Recs
Back
๐Ÿฅ— 9 Books about Health & Well-being
๐Ÿค” 18 Books about Things You Might Not Know
๐Ÿ‘จโ€๐Ÿ‘ฉโ€๐Ÿ‘งโ€๐Ÿ‘ฆ 15 Books about Interesting People
๐Ÿ›๏ธ 7 Books about the Present
๐ŸŒž 10 Books about the Past
๐Ÿš€ 2 Books about the Future
All Book Recommendations
๐Ÿค” Submit a Question
๐Ÿฆ„ Weird Wikipedia
Subscribe
Why do we scratch our heads when we think?
Psychology, Language Caitlin Olson 4/17/25 Psychology, Language Caitlin Olson 4/17/25

Why do we scratch our heads when we think?

Itโ€™s certainly a head-scratcher

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

Why does your voice sound different on a recordingโ€‹?

Hear me out โ€” your ears are deceiving you

Read More
Why do I cry when I laugh hard?
Science, Psychology, Anatomy, Biology Caitlin Olson 9/14/24 Science, Psychology, Anatomy, Biology Caitlin Olson 9/14/24

Why do I cry when I laugh hard?

We donโ€™t know for sure, but crying and laughing are both ways that your brain soothes you and reduces stress. Crying while laughing could also just be because your tear ducts are getting stimulated by your face muscles.

Read More
Why do clean sheets feel so good?
Life Skills, Psychology Caitlin Olson 8/22/24 Life Skills, Psychology Caitlin Olson 8/22/24

Why do clean sheets feel so good?

Definitely a top-tier life experience.

Read More
Why do we use metaphors?
Language, Psychology Caitlin Olson 4/18/24 Language, Psychology Caitlin Olson 4/18/24

Why do we use metaphors?

We use one unique metaphor for every 25 words spoken.

Read More
Why do harmonies sound good?
Science, Music, Math, Psychology, Culture Caitlin Olson 4/10/24 Science, Music, Math, Psychology, Culture Caitlin Olson 4/10/24

Why do harmonies sound good?

Our brains crave balance, order, and symmetry.

Read More
Why do we have emotions?
Science, Life Skills, Psychology, Biology Caitlin Olson 3/28/24 Science, Life Skills, Psychology, Biology Caitlin Olson 3/28/24

Why do we have emotions?

Theyโ€™re there to help you, I promise.

Read More
Why do humans kiss each other?
Science, Psychology, Biology Caitlin Olson 2/8/24 Science, Psychology, Biology Caitlin Olson 2/8/24

Why do humans kiss each other?

Or as one researcher described it, โ€œskin sucking behaviour.โ€

Read More
Why are dreams so hard to remember?
Science, Psychology, Biology, Anatomy Caitlin Olson 7/27/23 Science, Psychology, Biology, Anatomy Caitlin Olson 7/27/23

Why are dreams so hard to remember?

Our brain is making it hard on purpose, so it can focus on other activities.

Read More
Why do we get goosebumps?
Science, Psychology, Biology, Anatomy Caitlin Olson 7/13/23 Science, Psychology, Biology, Anatomy Caitlin Olson 7/13/23

Why do we get goosebumps?

Goosebumps would be a lot more useful if we still had fur.

Read More
What is an itch and why do we get itchy?
Science, Biology, Anatomy, Psychology Caitlin Olson 2/10/23 Science, Biology, Anatomy, Psychology Caitlin Olson 2/10/23

What is an itch and why do we get itchy?

Get ready to scratch the itch of wanting to know why we itch.

Read More
Why do we look away in conversation when we're trying to think?
Science, Psychology Caitlin Olson 11/25/22 Science, Psychology Caitlin Olson 11/25/22

Why do we look away in conversation when we're trying to think?

I canโ€™t look at you right now. Iโ€™m trying to think.

Read More
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 ๐Ÿ‘‡

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

Learn five facts about Caitlin.

Caitlin

Recent Articles

About

Book Recommendations

Privacy Policy