Qualifications for donation may include good health, an age range of 21 – 35, a family medical history free of genetic diseases such as cystic fibrosis, and often a maximum weight limit or BMI (body mass index). More desirable qualities include beauty, blonde hair and blue eyes, specific ethnicity (tall Japanese women are popular, for example), high SAT scores or stellar college grades, and such esoteric concerns as musical or artistic ability, depending on what prospective parents are looking for. Prospective parents often wish for a child that shares certain genetic traits like coloring and artistic nature, along with potential enhanced possibilities they find attractive, like height and intelligence. While paging through a catalogue of potential donors to find "ideal" characteristics to produce a perfect child seems like the plot of a really bad sci-fi movie, in reality, the prospective parents know that even the most perfect donor has a genetic mix that can produce entirely unexpected results.