Newly installed instruments on the Hubble Space Telescope may reveal the answers at last. Whatever its cause, depression ultimately emerges from biochemical shifts in the brain that provoke aching sadness, loss of pleasure, guilt, thoughts of death and other symptoms. Unfortunately, the practice creates its own environmental problems. Here an aquaculturist and environmentalist discuss how to make shrimp farming a more sutainable enterprise. The weird attributes of quantum mechanics might allow computers to solve otherwise impossibly hard problems.
Magnetic manipulation can turn molecules in a liquid into computing such devices.
Prototypes have already been built. Charting those minute variations was once impractical, but new sensors developed for submarines during the cold war have renewed prospectors' interests in this technology. Bert L. Vallee People have turned to alcohol for refreshment, and possibly more, for 10,000 yars. When clean water was almost nonexistent, nutritious and relatively safe fermented beverages might have been vital. This physician traces alcohol's journey from a necessary good to a sometimes dangerous drug.