An example of a triangulated irregular network. The known data sites (black points) are triangulated to form a convex hull.
Councillor David Merrett, chair of the Arlingham Parish Council and dairy farmer, said: "When we first had the email about it, I thought it was a joke."
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In 2011, hackers successfully cracked the main Linux development site, kernel.org. Afterward, to make sure this didn't happen again, the kernel's PGP web of trust was explicitly "bootstrapped" at a face-to-face key‑signing session during the 2011 Kernel Summit.