Famously, neutrinos, the nearly massless particles that are a fundamental component of the universe, can zip through a million miles of lead without skipping a beat. Now, in a critical measurement that may one day help predict new physics beyond the Standard Model of particle physics — the model that seeks to explain the fundamental forces of the universe — an international team of researchers with the IceCube Neutrino Observatory has shown how energized neutrinos can be stopped cold as they pass through the Earth.