Using nothing more than a swab of saliva and the internet, a15- year-old boy has tracked down his anonymous sperm donor father, according to details released today.

• 一位美国母亲曾从精子银行得到精子使一个男孩诞生。15年后，男孩仅仅利用唾液和互联网就寻找到了为他匿名提供精子的生父。