
The SciencesJanuary 1, 1989
Deep Earthquakes
They have posed a fruitful puzzle since their discovery 60 years ago. How can rock fail at the temperatures and pressures that prevail hundreds of kilometers down?

Deep Earthquakes
They have posed a fruitful puzzle since their discovery 60 years ago. How can rock fail at the temperatures and pressures that prevail hundreds of kilometers down?

The Physics of Somersaulting and Twisting
Divers, gymnasts, astronauts and cats can do rotational maneuvers in midair that may seem to violate the law of the conservation of angular momentum but in fact do not