1. Xem full clip tại đây 2. Tập luyện đoạn hội thoại 3. Clip lồng tiếng ở đây 4. Xem tapescript ở đây ·         Fly away, balloons ·         Haha, John. The ballon won’t fly away like that. ·         The ballons flew away with a house in the cartoon ·         Those balloons were probably flilled up with helitum gas. You are exxhaling carbon dioxide. Carbon dioxide is heavier than oxygen so your ballon will not fly. ·         Oh, so, is helium lighter than oxygen? ·         That’s right. ·         Oh, I see. I thought balloons would always fly in the sky! ·         Oh ·         I completely soaked! ·         Roy, does it rain on the moon? · ...