How long was a big dino's lifespan? On this week's Question of the Week, we find out how many candles a dinosaur birthday cake would have, and how we can tell from only fossilised remains. Also, we ask, what technology will we need to communicate with nearby stars (assuming we find anything to communicate with) and how does the shape of a didgeridoo affect it's sound? Like this podcast? Please help us by supporting the Naked Scientists