“You Matter. Unless/Until you multiply yourself by the speed of light squared. Then you Energy” is a science joke that has been printed on many images. The saying is based on the famous mass–energy equivalence in physics.

“You Matter - Until you multiply yourself times the speed of light squared. Then you Energy. http://tmblr.co/ZSyWkv1zo9IS2” was posted on Twitter by Patrick Toman on December 12, 2015. “You matter… Unless you multiply yourself times the speed of light squared. Then you energy” was posted on Twitter by Tara Abruzzese (and anoter) on June 25, 2016.

“There’s just no way around this one: YOU MATTER, unless you multiply yourself by the speed of light squared, then YOU ENERGY” was posted on Twitter by American astrophysicist, author, and science communicator Neil deGrasse Tyson on June 18, 2017, and again on Twitter on January 9, 2020. Tyson was not the first to use the saying.

Wikipedia: Mass–energy equivalence

In physics, *mass–energy equivalence* is the principle that anything having mass has an equivalent amount of energy and vice versa, with these fundamental quantities directly relating to one another by Albert Einstein’s famous formula:

*E=mc^2*

This formula states that the equivalent energy (*E*) can be calculated as the mass (*m*) multiplied by the speed of light (*c* = ~3×108 m/s) squared. Similarly, anything having energy exhibits a corresponding mass *m* given by its energy *E* divided by the speed of light squared *c*2. Because the speed of light is a large number in everyday units, the formula implies that even an everyday object at rest with a modest amount of mass has a very large amount of energy intrinsically.

Twitter

Patrick Toman

@PatrickAT

You Matter - Until you multiply yourself times the speed of light squared. Then you Energy. http://tmblr.co/ZSyWkv1zo9IS2

1:27 PM · Dec 12, 2015·Tumblr

Twitter

Travis Legge - Yugman’s Guide pt. 1 NOW AVAILABLE!

@TravisLegge

You Matter - patrickat: Until you multiply yourself times the speed of light squared. Then you Energy. http://tmblr.co/ZlGpXl1_UbQC-

5:38 PM · Dec 23, 2015·Tumblr

Twitter

♡

@infinitebiebs

You Matter - patrickat: Until you multiply yourself times the speed of light squared. Then you Energy. http://tmblr.co/Z7eTPx1_X-hB0

2:31 PM · Dec 24, 2015·Tumblr

Twitter

Tara Abruzzese

@tarakat_

You matter… Unless you multiply yourself times the speed of light squared. Then you energy ... Haha! Get it?? No…. K #ineedsleep

6:13 AM · Jun 25, 2016·Twitter for iPhone

Twitter

Clay Adams

@ClayAdamsBand

You Matter

Unless youre traveling at 4 times the speed of light

Then you energy

7:08 PM · Jun 25, 2016 from Eastpointe, MI·Twitter for Android

Twitter

Sarcasm

@sarcastic_us

You matter.

Unless you multiply yourself by the speed of light squared.

Then you energy.

12:26 AM · Jun 26, 2016·Twitter for Android

Twitter

wendell

@tekwendell

You matter. Unless you move at the speed of light. Then you energy 😊

8:55 AM · Sep 7, 2016·Twitter Web Client

Twitter

Pat Ron

@RapGodPatRon

You Matter…. Until you multiply yourself times the speed of light squared… Then you Energy.

8:57 PM · Dec 27, 2016·Twitter for Android

Twitter

Neil deGrasse Tyson

@neiltyson

There’s just no way around this one: YOU MATTER, unless you multiply yourself by the speed of light squared, then YOU ENERGY.

10:00 PM · Jun 18, 2017·TweetDeck

Google Books*Title* You Matter Until You Multiply Yourself by the Speed of Light Squared Then You Energy: 110-Page Funny Sarcastic Blank Lined Journal Makes a Great Teacher, Engineer Or Gag Gift Idea, 6x9*Author* Tiny Camel Books*Edition* illustrated*Publisher* Amazon Digital Services LLC - Kdp Print Us, 2018*ISBN* 1731562403, 9781731562401*Length* 112 pages

Google Books*Title* You Matter Unless You Multiply Yourself by the Speed of Light Squared Then You Energy: Science Lab Notebook, Blank Lined Journal, Diaries Gift for Science Lovers, Science Students.*Author* Trendy Press*Publisher* Independently Published, 2019*ISBN* 1693288559, 9781693288555*Length* 102 pages

YourTango*50 Positive Quotes From Different People Around The World*

Emily Francos

October 27, 2019

(...)

19. *You matter above all else.*

“You matter. Unless you multiply yourself with the speed of light. Then you energy.” — Farah, 17 years old, Logatec, Slovenia

Twitter

Neil deGrasse Tyson

@neiltyson

You Matter.

Unless you multiply yourself by the speed of light squared.

Then you Energy.

3:03 PM · Jan 9, 2020·Twitter Web App