Happy New Year DA/GA
I don't think that scientific knowledge is different from other forms of knowledge. I think science is just a more organised method based on the way human beings have always acquired knowledge. What we all did as Babies is very similar to the way science works. Babies are the best most dedicated scientists (perhaps Empiricists is more appropriate) around; they are completely, single-mindedly obsessed with the acquisition of knowledge by observation and experiment on the physical and social worlds.
They come into the world with some basic assumptions (given them by terrestrial Evolutions 4 billion year experiment), Consciousness, and proceed over a period of 4 years or so to build themselves into well functioning little people with a good control of there bodies and a profound understanding of the way the world works. If that was not enough they also learn vast amounts of cultural and social information such as gender roles.
There is even some evidence that the visual system use hypothesis and experiment to analyse what we see.      
Testability means just that. If I say I've got invisible Pink Fairies at the bottom of my garden that nobody except me can see; that is a useless piece of information to any one else because it cannot (even in principle) be tested.
I can't see that my belief that the speed of light is approximately 300000000 m/s is the same as someone else's belief in God (whatever that means).
All the best PP