Karl Popper's "principle of falsifiability" is one of the few philosophical ideas that physicists regularly mention. But science is far more complex than it suggests, says Robert P Crease As a ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American The world has been paying lots of attention ...

Can a theory that isn’t completely testable still be useful to physics? What determines if an idea is legitimately scientific or not? This question has been debated by philosophers and historians of ...