22 Facts About the Solar System

Mental Floss via YouTube
Mental Floss via YouTube

So you want to know everything there is to know about the solar system? The first and most important question you might want to get out of the way is: what, exactly, isthe solar system? As Mental Floss editor-in-chief Erin McCarthy tells us, "It's a group of celestial bodies located within the Milky Way galaxy."

At the center of these bodies is the Sun, which is orbited by eight planets; more than 150 moons; and millions of meteoroids, comets, asteroids, and a handful of dwarf planets (sorry, Pluto). But it's the Sun—a.k.a. that shining, 4.5 billion-year-old star in the middle of it all—that accounts for 99 percent of the solar system's total mass. (Think about that the next time you're shading your eyes from its glare.)

In this all-new edition of The List Show, Erin is sharing nearly two dozen fascinating facts about our solar system, including the reasoning behind Pluto's demotion (blame it on Eris, the first known dwarf planet). For more out-of-this-world facts, you can watch the full episode below.

For more episodes like this one, be sure to subscribe here.

The Origins Behind 30 Harry Potter Words and Spells

Mental Floss via YouTube
Mental Floss via YouTube

Muggle. Horcrux. Erised. Wingardium leviosa. To the outside world (or those aforementioned Muggles), Harry Potter fans seem to speak a language unto themselves. But in coming up with the unique words, phrases, and spells that define the Potterverse, J.K. Rowling often looked to the past—and to other languages—for her etymological cues.

In this edition of The List Show, Mental Floss editor-in-chief Erin McCarthy is conjuring up the meaning behind dozens of words and spells from Harry Potter’s world.

For more episodes like this one, be sure to subscribe here.

32 Ways School Was Different in America 100 Years Ago

Mental Floss via YouTube
Mental Floss via YouTube

Your social media feeds may be full of the faces of crestfallen kids posing for their obligatory back-to-school photos, but what has become an annual rite of passage was a rarity a century ago. In 1900, only 51 percent of kids aged 5 to 19 were enrolled in school.

In the latest edition of The List Show, Mental Floss editor-in-chief Erin McCarthy is sharing dozens of ways school was different in America 100 years ago.

For more episodes like this one, be sure to subscribe here.

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