Part 1 of 5 · freeIntroduction
In 1905 and 1915, Albert Einstein published two theories that turned physics upside down. Until then, science mostly followed Newton: time flowed the same way for everyone, everywhere.
Einstein showed that space and time are linked, and that gravity can be understood as a curving of that fabric. These ideas explain black holes and the Big Bang. They also correct the GPS in your phone, every single day.
The rest is in the Sophia app.The remaining parts, the open-book quiz and the full glossary. Free to start; Premium unlocks everything.
- 21905: special relativity
- 31915: gravity as curvature
- 4GPS, the proof in your pocket
- 5Waves, black holes, an expanding universe
Open-book quiz9 questions whose answers are in the text.
Glossary8 terms explained in a tap.
30 languagesThe same course, from French to Japanese.
