The day the most famous formula was published – level 2


In 1905, Albert Einstein was a young man. He worked for the Swiss Patent Office. He also worked on his theories about the laws of the universe.

On September 27, Einstein published his most famous formula, E=mc². The formula says that energy is equal to the mass of an object times the speed of light squared. It shows that inside a small solid object is a lot of energy.

This formula was later used for the creation of an atomic bomb.

Difficult words: formula (a series of letters and numbers which show a scientific law), equal (the same as), mass (how heavy something is), times (multiplied by), squared (when one number is multiplied by the same number, for example, 2 × 2).

What implications does Einstein's formula have for the modern day world?


Days in Levels is designed to teach you 3000 words in English. Please follow the instructions

How to improve your English with Days in Levels: 


  1. Do the test at Test Languages.
  2. Go to your level. Go to Level 1 if you know 1-1000 words. Go to Level 2 if you know 1000-2000 words. Go to Level 3 if you know 2000-3000 words.


  1. Read two new articles article at Days in Levels every day.
  2. Read one previous article too and check if you remember all new words.


  1. Listen to the new article and read the text at the same time.
  2. Listen to the new article without reading the text.


  1. Answer the question under the new article and write your answer in the comments.


  1. Choose one person from the Skype section.
  2. Talk with this person. You can answer questions from Speak in Levels.