dec 23, 2017 - Citations

Description:

https://www.safesearch.ask.com/web?q=ernst%20mach%20images&chn=prev&o=APN10162&geo=en_US&prt=&ctype=&ver=&tpr=121

https://www.youtube.com/watch?v=Pr_60xbMYvc

https://www.youtube.com/watch?v=hG4CY5MUYbM

https://youtu.be/_jSPq8p5eHs

Added to timeline:

23 Dec 2017

369

New timeline

Johannes Kepler and Ernst Mach

Date:

dec 23, 2017

Now

~ 6 years and 3 months ago