Golden Slams and boat-sinking walrus

On today's show: A boat-sinking walrus, International Day of Sign Languages, golden slam winners, a new aunty, and bringing woolly mammoths back to life. QUIZ QUESTIONS: 1. How much does Wally weigh? 2. What is Australia's national sign language called? 3. Where is Diede de Groot from? 4. What state is Nukunu Country in? 5. How long before scientists hope to have elephant-mammoth calves running around? BONUS TRICKY QUESTION: Where did Diede de Groot and Dylan Alcott secure their Golden Slams? ANSWERS: 1. 2,000 kilograms 2. Auslan 3. The Netherlands 4. South Australia 5. Six years BONUS TRICKY ANSWER: US Open in New York