Antimatter of Fact: Collider Generates Most Massive Antinucleus Yet

Most people know two things about helium. One is that it makes your voice comically high-pitched when you inhale it; the other is that it is extremely light, which is why balloons filled with the stuff float upward through the heavier air. But in particle physics terms–and especially when it comes to the nuclear physics of antimatter–helium is no lightweight.

See original here:
Antimatter of Fact: Collider Generates Most Massive Antinucleus Yet