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Comment Re:Heat related? (Score 4, Interesting) 190

Radiation blockage is mostly a function of mass the rays have to go through. The vast majority of cosmic rays are blocked by the 14 pounds per square inch/100 kilopascals of air above us. That means that a square inch of ground at sea level has 14 pounds of air above it. A square inch section of a rack above you would probably be in the pounds as well, and would block a good portion.

Comment Re:Cycling not the Answer (Score 1) 947

The three cities with the largest share of bike commuters are Seattle, Portland, and Minneapolis. Not exactly places known for nice weather. It's just a matter of dressing well and having fenders.

Cycling reduces stresses on the city street, and cycling infrastructure is dirt cheap compared to roads. I can get around the denser parts of my city (Seattle) much faster by bike than when I drive my car or take the bus. Even though it's really hilly and it is usually rainy.

Comment Re:Please (Score 4, Informative) 947

Motorcycle helmets actually offer good protection, while bicycle helmets don't. For any impact over about 10 mph, they are not going to signifcantly reduce the peak accelerations your brain experiences (it's your brain sloshing that does the damage). I guess they can prevent lacerations, but that's about it. Helmet advocates always quote a study from the 1980s (funded by helmet manufacturers) that showed an 84% reduction in brain injuries, but other work has not borne this out. (example)

Wearing a helmet is applying a different standard to risk than we do in many other situations. Cycling is actually slightly safer per mile than walking, yet we don't make peds wear helmets. Just the same, we could make drivers wear helmets just like race car drivers do. That would actually prevent a huge number of deaths. But we don't. So why are cyclists singled out to wear the safety yarmulkes?

As an additional point, helment laws are actually terrible for cycling safety. After Australia made helmets mandatory, cycling went down 1/3 overnight. Fewer cyclists means drivers are less likely to expect them. In addition, there is evidence that cyclists wearing helments engage in riskier behavior as a form of risk-compensation.

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