Fait-divers on mixing

"Neutrinos are not the only particles that exhibit mixing. Building blocks called quarks exhibit the property too. Physicists don’t yet know if mixing is an inherent property of all particles. But from what they know so far, it’s clear that mixing is fundamental to powering the universe. “Without this mixing, without these reactions, there are all sorts of critical processes in the universe that just wouldn’t happen,” McFarland says. “It seems nature likes to have that happen. And we don’t know why.”