In the Universe, there should be as much matter as antimatter. As soon as particles and antiparticles collide, they annihilate each other and what remains is energy. However, since we obviously live in a Universe with matter - there are stars, galaxies, the Earth and ultimately us humans - there must be a mechanism that disturbs this balance.
The solution to this mystery could lie in an incredibly rare decay in which the neutrino plays a decisive role. Dr. Felix Hagemann from the Max Planck Institute for Physics explains the exciting methods researchers are using to observe this type of decay - and why hundreds of kilograms of detector material are needed for this.