Dear Xander, Last Saturday, at a birthday party hosted by Mummymoo for her 2-year-old son, you managed to score a big bunch of helium balloons, 5 normal coloured balloons topped with a gold star-shaped balloon. You always had a love for balloons of any sort, but that evening you were particularly infatuated with the gold star balloon in that bunch. But after the party, as we were driving, I noticed the star balloon was losing its volume slightly faster than what one would usually expect from such balloons, so I said to you, “Your balloon’s losing gas. You know what would e a good idea? If we let it go…