(repeat) Changed your computer password recently? We all try to stay one step ahead of the hackers, but the fear factor is increasing. The risks can range from stolen social security numbers to sabotaging a national power grid. 

Sixty years ago, when hacking meant nosing around the telephone network, it seemed innocent enough. And not all modern hacking has criminal intent. Today, there are biohackers who experiment with implanted electronic devices to improve themselves, and geoengineers who propose to hack the climate. But in our efforts to cool an overheated planet, might we be going down a dangerous path?

In this second of two episodes on hacking, the modern variations of “hacking,” and their consequences. Plus: when does hacking a system improve it?  

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