I've heard quite abit of things about bosons and am quite confused. The biggest thing which distinguishes fermions from bosons, would be Pauli's exclusion principle. But I've also heard things about bosons having half- integer, while fermions have interger spin, among many others. I've also heard also that liquid helium can be considered a boson, but I once thought that bosons can be applied only to fundamental particles. What are the properties which distinguishes bosons and fermions?