Twenty-year-old Kosik may be living proof that an elephant never forgets. According to his keepers at the Everland theme park in Yong-in, Kosik has remembered and can vocalize at least seven words in Korean, words such as "hi" and "lie down" or "good".Scientists like Dr Daniel Mietchen from the University of Jena in Germany want to know more and they've come to the zoo to see what makes Kosik tick or talk.