
About this episode
今天了解到两种超酷的新材料。一种是非常轻的金属,轻到一个大大的金属块可以放在蒲公英毛茸茸的绒球上而不会把蒲公英压扁!这不是一种新的金属,而是一种新的金属构造方法。就是把金属做成很细很细的细丝,然后编织成一个结实的立体形状,这个形状里边99%都是空气,所以整个结构就会又轻又结实。另一种很酷的材料是可以自动填补裂缝的混凝土。这种混凝土如果出现裂缝,只要有水,就会自动把裂缝补好。这是靠混凝土中的一种微生物实现的,它遇水就会体积膨胀,把裂缝填满。
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