Technology Aims to Bring Us Longer Lives. How Ethical is That?

Life extension - using science to slow or halt human aging so that people live far longer than they do naturally - may one day be possible. Big business is taking this possibility seriously. In 2013 Google founded a company called Calico to develop life extension methods, and Silicon Valley billionaires Jeff Bezos and Peter Thiel have invested in Unity Biotechnology, which has a market cap of US$700 million. Unity Biotechnology focuses mainly on preventing age-related diseases, but its re