RollbackDr. Sarah Halifax decoded the first ever radio transmission received from aliens thirty eight years ago. Now, a second message is received, and Sarah, now eighty seven, may hold the key to deciphering this one, too if she lives long enough. A wealthy industrialist offers to pay for Sarah to have a rollback a hugely expensive experimental rejuvenation procedure. She accepts on condition that Don, her husband of sixty years, gets a rollback, too. The