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Fuzzy set theory allows expansion of coverage of the seafloor by the use of word-based data from core logs , sample descriptions , photos , and videos , as well as the more standard numeric data from a laboratory . These have included decorative and instructional posters , stickers , brochures and leaflets , bookmarks , pocket calendars , screen savers , quotable background papers , and videos , and each year the Secretariat is able to offer , not only the new material , but whatever has been left over from preceding years as well . Summary : By using cool hands on items such as an orange safety vest , a hard hat , and videos , students will learn all about the world ’ s trash problem and how they can do their part to help . Now , I do n't know how many of you have heard my lectures in years past , or videos , or what not , but I want to use some of the material that I was using back then because it 's so terribly important to understand . Mangold is the author of over 45 books , articles , and videos , and has received numerous awards .