Swift mission tallied water from interstellar comet Borisov

For the first time, NASA’s Neil Gehrels Swift Observatory tracked water loss from an interstellar comet as it approached and rounded the Sun. The object, 2I/Borisov, traveled through the solar system in late 2019. Read more

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Run-Time Polymorphism in Swift

This has come up several times on the forums, but I've never written it up in a standard place, so here it is: **There are only three ways to get run-time polymorphism in Swift.** Well, three and a half. (more…)

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