[quote]All random number generators in computers have a system to come up with a number.[/quote]Just wanted to chime in on this since it's something I know a little about. There are roughly three classes of random number generators in computing (that I would group them into). You have: 1. The run-of-the-mill random number generator functions like, C++'s rand(), Javascript's Math.rand(), PHP's rand(), and so on that are good enough for basic random number generation. They are, however, not good enough - not random enough - for security related purposes because they can be predicted. 2. Cryptographically Secure Pseudo Random Number Generators (CSPRNGs, like [url=http://php.net/openssl_random_pseudo_bytes]openssl_random_pseudo_bytes[/url], [url=http://msdn.microsoft.com/en-us/library/system.security.cryptography.rngcryptoserviceprovider.aspx]RNGCryptoServiceProvider[/url]) are another step up on and are used for security related purposes (ie. generating encryption keys). However, they are not truly random, hence the reason they're referred to as pseudo random. 3. So-called [i]Truly[/i] Random number generators or generation techniques that use entropy gathered from [url=http://www.random.org/]the atmosphere[/url], [url=http://www.truecrypt.org/docs/random-number-generator]the user (ie. mouse movements)[/url], and other [url=https://en.wikipedia.org/wiki/Entropy_%28computing%29#Potential_sources]hardware sources[/url]. With that in mind, I think it's really dependent on the context in which something is random - a perception of randomness. For the purposes of computing, a "guess the number game" that uses a basic random function is [i]random enough[/i] for the player. Similarly, a CSPRNG for cryptography is also [i]random enough[/i]. So (and just throwing this out there since what this is originally about isn't really my domain) perhaps the idea of randomness could also be explored psychologically as well.