<script>on mouseUpput the short name of this card into xTempput char 2 to 6 of xTemp & ".mov" into Movie--put Movieif Movie is not empty then-- put "Videos:WTN:" & Movie into pMovieplayMovie Movie,"Videos:WTN:"end ifend mouseUp</script>
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<text><span class="style10">eeing the Invisible (4 of 4)</span><span class="style7"></span><span class="style10">LANDSAT</span><span class="style7">The Landsat satellite program launched by NASA in 1972 has provided a wealth of information on a wide range of geographical phenomena ΓÇô data that would have been difficult or impossible to amass on the ground. The visible and infrared parts of the electromagnetic spectrum in sunlight are reflected with varying intensity by different areas of the EarthΓÇÖs surface, such as forest, sea and arable land. The Landsat satellites are equipped with scanning devices that are sensitive to, and able to measure, the different types of reflected radiation. The data collected in this way is transmitted in digital form to Earth, where it can be assembled by computer into images. The data can be processed in a variety of ways, specific features being enhanced to suit the requirements of a particular analysis.The two Landsat maps shown here are ΓÇÿbefore-and-afterΓÇÖ photographs. They are both of the low-land area along the Mississippi River in the states of Arkansas and Mississippi. The first map shows the area before heavy rains in the Southeastern states during March 1973. The second map shows the same area after the rains and the resultant flooding.</span></text>
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<text>ΓÇó WAVE THEORYΓÇó ACOUSTICSΓÇó OPTICSΓÇó ELECTROMAGNETISMΓÇó ATOMS AND SUBATOMIC PARTICLESΓÇó MEDICAL TECHNOLOGYΓÇó FINDING OILΓÇó DISCOVERING MINERALSΓÇó APPLIED PHOTOGRAPHY</text>
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<text><span class="style10">lectron microscopes</span><span class="style7"> are capable of magnifying objects far greater than optical microscopes. Here a scorpion is examined with a color electron microscope.</span></text>