Bryan Johnson· Author
A transatlantic roundtrip New York to London and back exposes you to up to 0.1mSV, equivalent to a standard chest X-ray.
The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
A transatlantic roundtrip New York to London and back exposes you to up to 0.1mSV, equivalent to a standard chest X-ray.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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a transatlantic flight exposes you to 0.1 millisieverts