00505nam a2200133 a 450000500170000000800410001705000220005824500110008025000220009126000440011344000550015752001490021265000100036120140414132055.0100520s19uu    xx            00    eng d  aREF 535bL54 2003  aLight.  aNorth American Ed  aMilwaukee, WI :bGareth Stevens,c2003.  aDiscovery Channel school science: physical science  aExplores the nature and properties of light, discussing such topics as refraction, the electromagnetic spectrum, optical illusions, and photons.  aLight