Popper recognizes that on any knowledge, there may be an unfalsified basis. After all, science is not the basis of our assumptions, science must begin from phil

Popper recognizes that on any knowledge, there may be an unfalsified basis. After all, science is not the basis of our assumptions, science must begin from philosophical assumptions (like materialism, empirism, none of them can be falsified). If not mistaken, he calls these things metaphisics.