The health benefits — both mental and physical — of friendships are myriad. But as we get older it becomes increasingly difficult to forge lasting bonds with new people. We consider the ways communication, emotions and our phase of life effect our relationships with friends.
Internal combustion engines power everything from cars to planes to lawnmowers. But despite more than a century of new technology, the basic design has barely changed. We explore the challenge of making an efficient engine, and why despite the current wave of “green technology,” most experts believe we’ll be using the combustion engine for decades to come.
- Levi Tillemann-Dick CEO of IRIS Engines, Inc.
- Edward Tenner Historian of technology and culture; author of Why Things Bite Back; author of Our Own Devices; senior research associate at the Smithsonian's Lemelson Center; blogger for theatlantic.com.
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