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Bryan Johnson carries an umbrella during high UV periods because excessive sun exposure can be lethal, even though sunlight is beneficial. He expects people to think it's extreme but sees it as one small step toward avoiding harm.

Bryan Johnson carries an umbrella during high UV periods because excessive sun exposure can be lethal, even though sunlight is beneficial. He expects people to think it's extreme but sees it as one small step toward avoiding harm.
You know the sun is great, but it may kill you. That's why during high UV times I use this umbrella. Now, you may say that's crazy. But it's one small thing I do towards this bigger objective of don't.