Dear Science: Moonwalking Apollo astronaut dies, eco-friendly bullets and carbon discoveries

Today on Dear Science, we have a guest covering Steve - his name is Allan Blackman, he teaches Chemistry at AUT, and he’ll be with us for the next few weeks until Steve gets back in February. Ximena chats to him on the show today about the death this week of the last person to walk on the moon, how the US army want to design biodegradable plant-growing bullets, and also about how it’s just been confirmed that carbon can exceed its four bond limit.