贝壳 : 我有金钟罩

Seashell Shapes Show Strength For Safety

Scientists have been looking to nature for inspiration for materials with useful properties. Insect exoskeletons and shark skin are examples of materials that exhibit strength, durability, and less wind and water drag.

They're also looking at natural construction that could inform our own design projects. In that arena, researchers recently focused on the shape and structure of seashells. In a new study, they report on the properties of two types of shells collected from a sea shore in southern India: a bivalve with a typical clamshell-style shell, and a screw-type shell belonging to a turbinate.

希拉里邮件被公开

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如何让你的梦想化为泡影

5 ways to kill your dreams

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All of us want to invent that game-changing product, launch that successful company, write that best-selling book. And yet so few of us actually do it.

狼是因为人才变成狗的

BBC News

  1. 美国承认未能成功遏制伊斯兰国
  2. 巴尔的摩复审,维持原判
  3. 墨西哥城十五人失踪
  4. 哥伦比亚泥石流死难者集体下葬
  5. 突尼斯成为美国非北约盟友
  6. 尼日利亚获救妇孺之中,疑似有恐怖线人
  7. 国际足联主席是个独裁者
  8. 人类帮助狼变狗