translation.en: So in conclusion, the eleventh reason for optimism, in addition to the space elevator, is that I think with technology, entertainment and design, we can actually increase the amount of tonnage of human happiness on the planet.
translation.zh: 所以，总而言之，在“太空升降机”的概念以外 乐观向上的第11个理由 就是我们可以利用科技、娱乐和设计 增加这个星球上 人类幸福的分量