Christopher Columbus | The Hills | Christopher Walken | Christopher Lee | Beverly Hills | Christopher Wren | Christopher Plummer | Christopher Reeve | Christopher Lloyd | Beverly Hills, California | Black Hills | Christopher Lambert | Christopher Kasparek | Christopher Hogwood | Christopher Marlowe | Christopher Hitchens | Christopher Guest | Christopher | Khasi Hills | Christopher Tolkien | Beverly Hills High School | Malvern Hills | Christopher Isherwood | John Christopher | Forest Hills | Christopher Fry | Bloomfield Hills, Michigan | Beverly Hills Cop | Adelaide Hills | Christopher Alexander |
Penny Singer was the second wife of microbiologist Christopher Hills, who was co-discoverer of the protein-rich plankton spirulina, the base for many natural food products, and founded the University of the Trees in Boulder Creek, California.