The ICECUBE experiment is so sci-fi, it deserved the Nobel Prize in Physics.
Francis Halzen was all, Hey, let's drill 2500-meter holes in the ice at the literal South Pole and put neutrino detectors down there.
The experiment fills an entire cubic kilometer. That deep ice is so pure that there's nothing for the neutrinos to hit except water molecules, and such collisions produce other particles that then move faster than light speed in ice so produce a flash of Cherenkov radiation, which is what the detectors see. Seeing high-energy neutrinos for the first time is helping with a bunch of outstanding astrophysics questions.
Funded by US tax dollars...yeah, we used to build cool stuff.
(Illustration from the Nobel Prize website.)
https://www.nobelprize.org/prizes/physics/2026/press-release/
