 Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006. Now a Popeye's fast food restaurant on Google Maps.

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Entry from March 26, 2016
“Energy equals milk chocolate squared”

Albert Einstein (1879-1955) wrote the famous formula of mass-energy equivalence of “E=mc2” or “energy equals mass times the speed of light (squared).” Chocolate—the chocolate bars are often in squares—gives people energy, and the formula is jocularly given as:

“Energy equals milk chocolate squared.”

“Energy = Milk Chocolate Squared” has been cited in print since at least 1997.

Wikipedia: Mass-energy equivalence
In physics, mass–energy equivalence is a concept formulated by Albert Einstein that explains the relationship between mass and energy. It states every mass has an energy equivalent and vice versa—expressed using the formula

E = mc2

where E is the energy of a physical system, m is the mass of the system, and c is the speed of light in a vacuum (about 3×108 m/s). In words, energy equals mass multiplied by the speed of light squared. Because the speed of light is a very large number in everyday units, the formula implies that any small amount of matter contains a very large amount of energy. Some of this energy may be released as heat and light by chemical or nuclear transformations. This also serves to convert units of mass to units of energy, no matter what system of measurement units used.

Relativity of Knowledge
Shawn MacIntyre
1/10/97
(...)
Energy = Milk Chocolate Squared

Chicken Curry
Spuddie
1/9/00
(...)
Cheryl
~~~Energy equals milk chocolate squared.~~~

ghen rocks!!
Sunday, December 10, 2006
einstein’s formula
E=mc2
Formula: “Energy equals milk chocolate squared”
Posted by bea ghen at 12:51 AM

Google Groups: Evangelical Baptist International Network
21st Century Equation
EBiNet Moderator
7/20/07
E=mc² ......  “Energy equals milk chocolate squared”

Nerd Approved
Einstein Energy Bar is Chocolaty Brain Food
by SEAN FALLON on JUNE 20, 2008
Apparently, E = mc² actually referrers to energy equals milk chocolate squared.

RT @SwamiFraudAnand: @shaaqT Energy equals milk chocolate squared
7:10 AM - 21 Mar 2010

Todun Akinremi
‏@ToDuN
Formula: “Energy equals milk chocolate squared”
2:06 PM - 8 Apr 2010

Te arde que sea Ingenier@. Y soy Muy “Guap@” por Cierto.
October 17, 2013 ·
E=mc^2
Energy = Milk Chocolate squared

Science Notes
April 13, 2015
Physics Jokes
by Todd Helmenstine
(...)
Q: What does E = mc2 mean?
A: Energy = milk chocolate squared.