Grab onto something cute and cuddly. The long-awaited and hoped-for panda cub at the National Zoo, which was born Sept. 16, has died. The cause of death has not yet been determined. The baby panda had been the first panda cub to be born at the zoo since 2005. Experts had believed that there was a less than 10 percent chance that Mei Xiang, the panda’s mother, would become pregnant this year. But she surprised panda watchers Sept. 16 when she gave birth. Tragically, the panda only lived about a week, but hopefully the cub found a place in panda heaven.