IT is the purpose of this note to direct attention to the importance of a recent experiment 1 on the constancy, with time, of the frequency of light from an emitting atom, from the point of view of ...

Even when we consciously know two lines are the same length, why can't we help seeing them as different? ILLUSIONS are anomalies that can reveal clues about the mysterious workings of the brain to ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 14, No. 6 (Jun. 15, 1928), pp. 491-496 (6 pages) ...

THE recent correspondence in NATURE regarding the constancy of the velocity of light raises the auxiliary question as to the constancy of the wavelength of light. Experimentally, this is best ...

Sigmund Freud had a nephew named Ernst with whom he would play peek-a-boo. Freud would hold a teddy bear at the edge of Ernst's crib and then drop it out of sight. Ever the scientist, Freud noticed ...