Full Idea
Kuhn contends that almost all theories are falsified at almost all times.
Gist of Idea
Most theories are continually falsified
Source
report of Thomas S. Kuhn (Structure of Scientific Revolutions (2nd ed) [1962]) by Philip Kitcher - The Nature of Mathematical Knowledge 07.1
Book Reference
Kitcher,Philip: 'The Nature of Mathematical Knowledge' [OUP 1984], p.153
A Reaction
This is obviously meant to demolish Karl Popper.