What tires are you using? Special tubeless or regular tires with conversion kit?
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The current (June) issue of Bicycling Magazine has an article "Why Your Helmet Should Be Safer" that discusses the limits of current helmet designs and why it's so difficult to incorporate newer and better technology.
In brief, the author states that modern helmets do a great job of keeping your head intact in major crashes but do a poor job of preventing concussions. He describes why that's the case, a couple of better technologies and why it's so difficult to get the CPSC regulations changed to require them. Worth reading.