Ortake speed. In the 19th century horses and sailboats were replaced by railwaysand steamships. Internal-combustion engines and jet turbines made it possibleto move more and more things faster and faster. But since the 1970s humanityhas been coasting. Highway travel is little faster than it was 50 years ago;indeed, endemic congestion has many cities now investing in trams and bicyclelanes. Supersonic passenger travel has been abandoned. So, for the past 40years, has the moon.
再以速度为例:19世纪的时候,马车和帆船被火车和蒸汽轮船取代,内燃机和喷气涡轮机让越来越多的事物以越来越快的速度运动成为可能。不过,自20世纪70年代以来,人们就开始滑行了。在高速公路上旅行只比50年前快那么一点;事实上,地方性的交通拥堵让许多城市把资金投入到有轨电车和自行车道的建设上去。超音速的旅行方式已经被禁止。因此,人类已经40年没有登上月球。
Medicineoffers another example. Life expectancy at birth in America soared from 49years at the turn of the 20th century to 74 years in 1980. Enormous technicaladvances have occurred since that time. Yet as of 2011 life expectancy restedat just 78.7 years. Despite hundreds of billions of dollars spent on research,people continue to fall to cancer, heart disease, stroke and organ failure.Molecular medicine has come nowhere close to matching the effects of improvedsanitation.
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