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Science & Space

The most popular blog posts about science & space on Hacker News. 2,038 posts.

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1621

Continuous Glucose Monitoring

Continuous glucose monitoring has been a thing for a while. It's a probe that sits just inside your body and measures blood glucose levels frequently. Obviously this is most useful for type 1 diabetics, who need to regulate their blood glucose manually.

1639

How do traffic signals work? (2019)

If you live in a major city, I can take a pretty good guess at one of your most common frustrations: traffic. In city driving, the journey is rarely better than the destination. In most cases, we just want to get where we’re going. Traffic is not just frustrating, but it has consequences to the envi

1641

Traffic Experiments -- How to clear traffic jams

Once upon a time, years ago, I was driving through a number of stop/go traffic waves on SR 520 at rush hour in Seattle. I decided to try something. On a day when I immediately started hitting the usual "waves" of stopped cars, I decided to drive smoothly. Rather than repeatedly rushing ahead with everyone else, only…

1644

Entropy in the Universe

If you click on this picture, you’ll see a zoomable image of the Milky Way with 84 million stars: But stars contribute only a tiny fraction of the total entropy in the observable Universe. If…