they've now traced it to several locations, including north africa, near the ancient site of carthage, and, oddly enough, to my ancestral home, the coast of norway. >> it spread to norway, we think, because of viking occupation. there were some vikings living in and around carthage at around 1000 ad, and this particular mutation is quite common on the northern coastline of norway. >> narrator: my grandfather's birthplace is on the norwegian coast, next door to norway's first viking settlement. so did my own family's parkinson's saga begin a thousand years ago, when some seafaring relative came calling in carthage? >> with your particular description of your disease and your family history and origin, there's quite a high chance, i would think, that you have a genetic form of the disease. >> narrator: quite a high chance, though still not certain. but oddly enough, that possibility might bring a bit of family luck, and here's why. this is a graphic representation of the lrrk-2 gene, the gene in question, and it offers researchers a readymade target for fixing the disease. farrer thinks

carthag >>pam: and coming up at 8:30 p.m., the san francisco school board is poised to make some drasticdeal with a looming budget deficit. the largest u.s. city is on the brink of bankruptcy. the stockton city council is voting on a decision. plus, a nationwide pilot program right here in the bay area, we will tell you how to get a free hiv test. >>jaqueline: here is a live look outside from downtown san francisco. clear skies now, it will stay that way overnight. another warm day on tap tomorrow, details coming up. >>pam: here is a recap of the big stories we have been falling this evening. oakland police are searching for a man who sexually assaulted a woman near lake merritt. it happened inside of a restroom at lakeside park on june 7th. here is his description, a heavyset man in his 30s with a tattoo on his back, dreadlocks and a jamaican accent. police are offering a $5,000 reward for information about the suspect. human rights activist bleary brendon is suspected of being in possession of child pornography, infants and toddlers in extreme sexual situations. he was arrested on frid