URSpider94
Joined 17 years ago
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Joined 17 years ago
The trick is to design a system where the total power absorbed across the solar irradiance spectrum is less than the power that is emitted in the sky window, so that the system is a net power sink (in this case to the tune of 100W per sq. meter or so).
Not a great reason …
The other interesting stat is that an hour of bike riding in NL carries approximately the same risk of head injury as an hour in a car in the USA. So, should we make all car passengers wear helmets? It would make them safer…