Https://www.toptal.com/bitcoin/blockchain-technology-powering-bitcoin
i dont have the time to read it right now, but i was able to find you this link that should hopefully help- you out!
Ok if lets say a young child at the age of like 6-7 was allowed to play grand theft auto by his/her parents maybe the child would understand incorrectly and start doing what the people do in the game this may cause to serious trouble jail time or even death. In this case dont let your kids play underrated games or watch underrated movies.
Hope that helped you understand more.
2.5 is a float.
Float stands for floating point. Floating point types are numbers with decimal places. I hope this helps!
