>https://www.watchuseek.com/watch-president-donald-trump/
>We are facing a true existential threat.
"An existential risk is any risk that has the potential to eliminate all of humanity or, at the very least, kill large swaths of the global population, leaving the survivors without sufficient means to rebuild society to current standards of living."
>Sorry just needed to finish. The truth is that the jury is still out
Why the copypasta, why not just post the link…
http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html