We've gotten very used to having GPS technology available. In fact, some people are dependent on it (to a worrying degree - I don't like talking to 30 year olds who can't read a map).
GPS glitches for all sorts of reasons. Losing line of sight on the satellites at a key moment, really bad weather, dark matter...
...wait?
Yes. It seems dark matter actually alters GPS signals and sends them very minutely out of sync. Something which might help us in our quest to understand a substance that might make up more of the universe than hydrogen.
(Although likely the gravity detecting clock will be more useful).
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