Philosophy and science - Badiou interviews Canguilhem

What is philosophy of science? What is epistemology? What are the relationships between science and truth? Between science and technique?
Interview with Alain Badiou Georges Canguilhem
Extract from a Cnaguilhem response on the technique:
"The progress of science has by itself demonstrated the truth of science. He brought in that there is no break between a laboratory in the academic sense of the term and an industrial test bench. What brought the verification of science as the explanation was the application. It is the fact that science has naturally extended into technique and to the extent that through science on transforms the external real on gives the proof that the explanation that one gives is truly granted to the real.
I do not measure the value of science by its power to transform reality. I say this: science is an explanation that must be proven or verified. The technical applications are specifically the verifications of these explanations.
The technique is not the truth of science. The technique can be, has been and will remain in certain fields of an activity whose development obeys other requirements and other needs than scientific need proper. But insofar as it appears at a given moment that the information of a technique by theory drives this technique a revolution which now gives it a power of extension and expansion which it did not have when it was simply spontaneous, from the moment the technique receives from a science even if science is constituted separately from it the means of solving problems that it could not already solve, this is the proof by the fact that scientific theory has brought to technique a relation of agreement with the external real. "