Lesson 1
The following is the link to Lesson 1: Lesson notes 1.
And the following is the link to Homework 1: HW 1.
Special Relativity


Galilean addition in the case of a bullet and light emitted by a flaslight from a moving train.
Ehrenfest and the thought experiment proving that special relativity in the case of non-inertial frames was hinting at the need for a curved space-time.