According to current theories of expertise, this shouldn't happen. Becoming an expert in chess, for example, makes you better ...

This illusion was discovered by German psychologist Herman Ebbinghaus in the 19th century. This and similar geometrical illusions have been studied by psychologists ever since. How much you are ...

This illusion was discovered by German psychologist Herman Ebbinghaus in the 19th century. This and similar geometrical illusions have been studied by psychologists ever since. How much you are ...