The protons and neutrons of every atomic nucleus contain not only subnuclear particles called quarks, but also their antimatter counterparts, antiquarks. Professor Aidala will discuss her research studying antimatter in the hydrogen nucleus as well as in more complex atomic nuclei such as carbon. Investigating the antimatter content of nuclei has been yielding surprises, in particular for antiup and antidown quarks, which can be probed directly by annihilating them with their corresponding matter partners, up and down quarks.