Isn't the classical definition of Arrow of time is from the system with less entropy to a system with more entropy? What is lacking in this definition of Arrow of time that we need to take it to Quantum level?
Again, probability is just a model that can predict something, but not explain how it works. Take a pseudorandom number generator and do rand() > 0.5. Your probability is 50%, and that is a pretty good model to predict how the subroutine will behave, but it may also be useful to understand what algorithm the PRNG is using.
Yes, but it varies, because we have automatic malware detection, automatic hacked site detection, and manual hacked site detection.
For example, if we manually detect that a subdirectory of a site is hacked, we may remove only that subdirectory from our search results. If your entire site is hacked, then your entire site may be demoted or removed until the site is clean.
Cats have limited intelligence but general purpose intelligence. Compare a kitten to a computer with computing power but without intelligence. Now kitten to cat maturity gives the animal a wisdom and intelligence. That maturity is in nowhere similar to Watson as a pure hardware (kitten) to Watson with software of AI (cat).
No, client can be built on any platform. The client interacts with the server which plugs into the API which is in Python. You can even build a wrapper around the API in your preferred language and have it interact with the API.
Wrapper is preferable in case you want to enhance the functionality provided by the whatsapp API.