Word: delta
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...week during the second excursion by Astronauts Dave Scott and Jim Irwin. After driving past a group of craters called the South Cluster, they made their way up a 7° slope toward the mountainous Apennine Front, and approached an imposing 12,000-ft. peak called Hadley Delta. The astronauts stepped out of the rover and began to select rocks, describing each to the fascinated geologists back in the science support room in Houston. One rock looked like "green cheese"-until Scott raised his gold-tinted visor and saw that it was really gray...
Muddy Waters is the king of dirty blues, down-home blues, funky blues or straight blues-most properly known as Delta or country blues. Along with such other black masters of this unique American art form as B.B. King and Howlin' Wolf, Muddy is riding the crest of a surprisingly long-lived blues revival. Of them all, he remains the purest, the most loyal to where he has been and what it has cost him. Muddy's brand of Delta blues is supposed to follow the traditional twelve-bar structure, but as often as not uses eleven...
...indeed a land of unexpectedly lush and verdant beauty, whose emerald rice and jute fields stretching over the Ganges Delta as far as the eye can see belie the savage misfortunes that have befallen its people. The soil is so rich it sprouts vegetation at the drop of a seed, yet that has not prevented Bengal from becoming a festering wound of poverty. Nature can be as brutal as it is bountiful, lashing the land with vicious cyclones and flooding it annually with the spillover from the Ganges and the Brahmaputra rivers...
...most forbidding region man has ever attempted to visit on the moon. To the northeast lies a towering, 15,000-ft. peak called Mount Hadley. Another mountain, Hadley Delta, only slightly less majestic at 12,000 ft., looms directly to the south. To the west is a winding, milewide, 1,200-ft.-deep canyon. Yet two U.S. astronauts are scheduled to land in the midst of that treacherous terrain at 6:15 p.m. E.D.T., Friday, July 30. Their landing will mark the beginning of man's fourth and most daring lunar assault...
Letting Go. The brain's constant electrical activity produces wave patterns that can easily be measured with an electroencephalograph attached to the scalp. The patterns, recorded by the EEG as tracings on ribbons of paper, come in four main wave lengths: delta (.5 to 3 cycles per sec.), occurring in sleep; theta (4 to 7 per sec.), linked to creativity; beta (13 to 30 per sec.), identified with mental concentration; and the relaxed alpha (8 to 12 per sec.). It was only in 1929 that German Psychiatrist Hans Berger discovered alpha waves and not until 1958 that experimenters began...