In what context are they using the word information? If I delete a file on my computer it is lost information. If my dog eats my homework it is lost information. If I lose a phone number written on paper it is lost information. If I forget the combination to a lock I have to throw it out. Tesla's information about his best discoveries were lost with his death. Edward Leedskalnin's information on antigravity is lost. It seems to me information is lost all the time. What am I missing here? I've heard every molecule of water has information in it. What are they talking about?|||This usually relates to the question of whether information is lost crossing the event horizon of a black hole. Black holes are very simple things, capable of having the properties of mass, spin, electric charge and that's about it. So, if you toss a rocket into it, how could the universe possibly tell after the fact that it wasn't a meteor of the same weight, charge and spin. Where is the information differentiating between rocket and meteor being held? Further, since the black hole is destined to eventually evaporate via random Hawking radiation, how is any rocket information brought back into the universe?|||This is a corollary to 2nd Thermo. : information can not be untangled without increasing entropy. (paraphrased) Entanglement is knowledge within a system. For example, you remember you deleted your computer files, you remember you lost a phone number, and you remember you forgot your combination. You are entangled within the system, be it local or across the horizon or on the other side of Andromeda. Information is lost when entanglement is undone and reverts to a ground state, not when you forget your keys or your wallet or your password to your computer.|||The law of conservation of energy says that energy cannot be created nor destroyed, only converted from one form to another. This is the same idea with "information". Information is used as a general term for all mass and energy and what it was doing as some point in time. For example, if you blow up a chair, all the "information" is there. Therefore, using all the information after the explosion, we can reverse the blown up chair and recreate what the chair was like before it was blown up into pieces! Hope this helps!

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