text: Heavy-fermion superconductivity was discovered already in the late 1970s (with CeCuSi being the first example), but the number of heavy-fermion compounds known to superconduct was still very small in the early 1990s, when Christoph Geibel in the group of Frank Steglich found two closely related heavy-fermion superconductors, UNiAl (T=1K) and UPdAl (T=2K), which were published in 1991. At that point, the T=2.0K of UPdAl was the highest critical temperature amongst all known heavy-fermion superconductors, and this record would stand for 10 years until CeCoIn was discovered in 2001.