Canadian scientists accidentally discovered when studying "Williams syndrome" that people with musical and mathematical talents are actually caused by a genetic disorder, and the same genetic disorder may also lead to mental illness such as schizophrenia. Most children born with Williams Syndrome are staggered by 20 genes on chromosome 7 in their bodies. This occurs in one in every 20,000 people worldwide. What is the author most likely to focus on next? ['Genetic disorder and genius.', 'What is "Williams Syndrome".', 'Typical cases of "Williams syndrome".', 'The significance of chromosome 7 to humans.']