This video is about how terrestrial muons are part of our experimental proof of time dilation, length contraction, and special relativity in general.
REFERENCES
Cosmic Rays
https://en.wikipedia.org/wiki/Cosmic_ray
Terrestrial Cosmic Rays
http://people.physics.tamu.edu/wwu/docs/P225/P225_Project_terrestrial%20cosmic%20rays.pdf
Cosmic Ray Interaction Depth & Muon Production Altitude
http://cosmic.lbl.gov/SKliewer/Cosmic_Rays/Interaction.htm
Cosmic rays are stronger at the poles
http://www.antarcticglaciers.org/glacial-geology/dating-glacial-sediments-2/cosmic-rays/
Cosmic Rays on Hyperphysics
http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/cosmic.html
Exponential decay and mean lifetime
https://en.wikipedia.org/wiki/Exponential_decay#Mean_lifetime
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