Strange matter Illustration of how antihyperhelium-4 – a bound state of two antiprotons, an antineutron and an antilambda – is created in lead–lead collisions at CERN. (Courtesy: CERN/ J Ditzel with ...

The first simple antimatter nucleus (an antiproton stuck to an antineutron) was discovered a few decades later. In 1995, scientists at the CERN particle accelerator finally filled in the first ...