Each summer, lawns are marked by a familiar addition: "silly sprinklers," whose loops and spirals spew water in creative ways. While seemingly frivolous in their construction, a team of mathematicians has used their design to address a long-standing mystery surrounding the laws of physics.
Source: [Phys.org](https://phys.org/news/2026-07-silly-sprinklers-reverse-unravel-decades.html)