Tendon the Achilles tendon stretches as the ankle joint dorsiflexes. During the last portion of the stride, as the foot plantar-flexes (pointing the toes down), the stored elastic energy is released. Furthermore, because the tendon stretches, the muscle is able to function with less or even no change in length, allowing the muscle to generate greater force. The mechanical properties of the tendon are dependent on the collagen fiber diameter and orientation. The collagen fibrils are parallel to each other and closely packed, but show a wave-like appearance due to planar undulations, or crimps, on a scale of several micrometers. In
Material of the Future a worldwide view from a variety of perspectives considering what the true value of plastic is. Covered topics include re-usable plastics, plastic pollution, plastic industry, controversies of plastic recycling, bioplastics, and plastics in human health. The film includes footage from Chinese recycling facilities, the world's largest plastics convention, the Los Angeles bag ban, heart replacement surgery, the Plasticarium in Brussels, and is interspersed with interviews from scientists, authors, artists, and environmentalists. The film is scored by Richard Swift with additional music from Baths and a previously unreleased track from Animal Collective. Material of the Future Material of the Future is