101: Why is the Sky Blue & Speech Disfluency

12th March 2026

For episode 101, we’re challenging ourselves to make a technically family friendly, swear free episode! Why is the sky blue? Well it turns out it took a lot of science to understand why! And what is speech disfluency? Well it’s like… um… you’ll see! Images we Talk About: Green Flash Sunset Timestamps: (00:00:00) Intro (00:06:43) […]

Episode notes

For episode 101, we’re challenging ourselves to make a technically family friendly, swear free episode! Why is the sky blue? Well it turns out it took a lot of science to understand why! And what is speech disfluency? Well it’s like… um… you’ll see!

Images we Talk About:
Green Flash
Sunset

Timestamps:
(00:00:00) Intro
(00:06:43) Why is the Sky Blue
(00:54:28) Speech Disfluency
(01:40:45) Outro

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We also learn about:

StellarNet: A Brief History of the Sky’s Blueness
Blog: The bizarre myth that Ancient Greeks couldn’t see blue
2023 Paper: Revisiting the question “Why is the sky blue?”
Wiki- John Tyndall
The Conversation: John Tyndall: the forgotten co‑founder of climate science
Wiki: Rayleigh Scattering
NASA: The Electromagnetic Spectrum
Scientific American: Mirages
IFL Science: Orange Sky
The Great Oxidation Event: How Cyanobacteria Changed Life
Royal Museums Greenwich: Why Is The Sky Blue
Mars in a Box: Martian Sunsets

Wikipedia: Filler (linguistics)
Thought Co: Definitions and Examples of Filler Words
The Register: Why Do We Say Um?
Paper: Listeners’ Uses of Um and Uh in Speech Comprehension
New York Times: So, Um, How Do You, Like, Stop Using Filler Words?
University of Colorado Paper: We, um, have, like, a problem
Guardian: Why Do People Say Like So Much?
NPR: Why Do We Say Um So Much?
BBC: Teen Slang
Paper: Fillers, Pauses and Placeholders
Cambridge: Hidden Use of Fillers
The British National Corpus 2014
Language Hat: The Mystery of Fillers
The Atlantic : “Men Say ‘Uh’ and Women Say ‘Um’”
Language Log: Men and Women’s Use of Words
JStor: Filler Words and Floor Holders
THE CALIFORNIA STORY 1906 By Thomas A. Edison

In this episode...

About the show

Science communicators Ella Hubber, Tom Lum, and Caroline Roper share anything and everything interesting! Each episode they teach each other about a science topic, answer a question, and learn about a miscellaneous topic. Whether it’s temporal illusions, animals in space, or the history of fanfiction, there’s so much out there, so let’s learn everything! Join us on Discord, email us, and follow us everywhere at LetsLearnEverythingPod.com.

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