1. When does an observation become scientific law? How many times should an experiment be conducted to make turn a hypothesis into a theory?
It becomes a scientific law when it get's proven. Enough times to the point the results are consistent and reliable
2. Is science created or discovered?
It can be created however, I believe it is discovered as nothing can be created by man without the source of material's found on earth.
3. how reliable is your science textbook?
Yes, because the science textbook is full of proven laws and theories. However if a law or theory is disproven then the whole book will be re-written.