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And I knew that if I wanted to last , and I really did want to last , I could n't do better than they . In some cases , the cracks may not be apparent for 5 or 10 years , but after they do appear , they can rapidly progress into distresses that significantly affect the long-term performance of the pavement . The web is an integral part of the course as a source of outside information , where my lectures originate , and where the students post their homework . But when they need to get onto dry land , they face a problem : surface tension , the same phenomenon that allows these creatures to exist , makes water curve upwards at the shore ; the inclined surface marking the edge between wet and dry is called the meniscus .