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Midwest community where howard hu and his team are discovering environmental dangers unearthed from over 60 years of mining. But dangerous exposures are found everywhere. In new yorks inner city robin whyatt is researching the effects some common household chemicals may be having on us and our children. Two studies in two very different places both measuring hazardous exposures, provide a better understanding of the unseen risks that we all take every day and the consequences those risks have on our health. Located in the far northeastern corner of oklahoma the town of picher has a unique landscape. Just steps away from homes schools, and playgrounds sit manmade mountains. Since the turnf the last century through the 1970s, the abundant underground resources of lead and zinc ore were mined to supply among other things material for ammunition used during world war ii. But along with the lead and zinc came tons of mining waste, creating these mounds, called chat piles, that have always b ....
[playing buzzing and whirring sounds on a jewsharp] brown timbre is tone quality, you know, when you listen to a sound, when you listen to a musical note, you hear several things. [throaty singing] you hear the basic note, but you also hear some overtones. You hear some other sounds that are generated. [shrill flute plays] the particular combination of overtones that you hear gives each Musical Instrument its own sound. [single note played on various instruments] you could play a note say a g on a guitar, and you could play that same note on a flute. The fundamental frequency of the note, the g, is the same, but the timbre is not. And what makes the timbre is the mix of the overtones that you hear along with the fundamental note. [choir sings] leek timbre for me is the very essence of a particular sound and the way that it can be developed or changed in its smallest part so that it becomes something else. It can be a very pure ....
That are in love with each other. [low hum and sticks clacking] [cultural music montage] narrator all over the world with instruments and voice, people create an uncountable number of melodies in an enormous variety of styles. The methods in which a musical culture generates its melodic forms depend on the musical rules and practices of that culture. These rules are employed by composers and performers, and are implicitly understood by listeners as well. That baby boy i never saw before. narrator but at the basis of all melodic form is the concept of vibrational frequency or pitch. [low, airy pipe plays] man pitch is the highness or lowness of the sound. Its a matter of how many vibrations per second form the fundamental frequency of the sound. For the musician, of course, the pitch at least in the western vocabulary, are the 12 pitches of the octave divided up, and heres a chromatic scale, and thats all we have each of those pitches or pitch classes from c to c is reproduced in every ....
Where howard hu and his team are discovering environmental dangers unearthed from over 60 years of mining. But dangerous exposures are found everywhere. In new yorks inner city robin whyatt is researching the effects some common household chemicals may be having on us and our children. Two studies in two very different places both measuring hazardous exposures, provide a better understanding of the unseen risks that we all take every day and the consequences those risks have on our health. Located in the far northeastern corner of oklahoma the town of picher has a unique landscape. Just steps away from homes schools, and playgrounds sit manmade mountains. Since the turnf the last century through the 1970s, the abundant underground resources of lead and zinc ore were mined to supply among other things material for ammunition used during world war ii. But along with the lead and zinc came tons of mining waste, creating these mounds, called chat piles, that have always been a fixture in t ....