Useful sites

                
Siti utili:
Googolplex Written Out:
http://www.googolplexwrittenout.com/
100,000 Digits of Pi (π) in 5 minutes:
https://www.youtube.com/watch?v=NBKeK4_3_Hs
Dynamic Periodic Table:
http://www.ptable.com/#Orbital
Periodic Table of Periodic Tables:
http://www.keaggy.com/periodictable/
Demonstrations of physics, chemistry and other stuff like that:
http://freezeray.com/index.html
https://phet.colorado.edu/
http://falstad.com/ (the best)
http://minutelabs.io/
Quick, Draw! Recognize drawings:
https://quickdraw.withgoogle.com/