Is there a scientific reason why the universe exists? In other words, what is the science of why there is anything at all, instead of only nothing?

The answer has to do with opposites. Scientists have found that the universe exists because it began with a slight imbalance between matter and antimatter. Particles of matter — that is, all of the electrons, protons and neutrons in the atoms and molecules of regular stuff — differ from particles of antimatter, which carry the opposite electric charge but are similar in many ways.

New computer simulations suggest the first magnetic fields that emerged after the Big Bang were much weaker than expected — containing the equivalent magnetic energy of a human brain.