bookwyr.mexkcd #3158: Shielding Chart
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xkcd bothttps://imgs.xkcd.com/comics/shielding_chart.png
Title text:
Sharks can occasionally travel short distances through air when pursuing prey, but their attenuation coefficient is pretty high.
Transcript:
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Source: https://xkcd.com/3158/
the demon core for neutron source is funny