By A TV screen shows a report of North Korea's rocket launch with file image during a news program at the Seoul Railway Station in Seoul, South Korea, on Thursday. Lee Jin-man/APSEOUL, South Korea — North Korea said Thursday that its second attempt to launch a spy satellite failed again but vowed to make another attempt in October, demonstrating willingness to endure flops to acquire a key military asset coveted by leader Kim Jong Un. But experts say North Korea still has some technological hurdles to clear before obtaining functioning nuclear missiles