Speed of light is 300 000 km/s, or 1 foot pre nanosecond Light year = distance covered by light in one year
- worked in Swiss pattern office
- 1905 was his miracle year, several papers
- "time is suspect"
- invariance of the speed of light to all observers
- clocks that are synchronized in static frame of reference are not synchronized in moving frame of reference
- time dilation - someone who observers moving clock will see moving clock move more slowly than theirs
- length contraction
- Lorenz transformation between inertial frames of reference
reversal of cause and effect