Sir David Attenborough has responded to a letter from a four-year-old boy asking if humans will ever go extinct, just like the dinosaurs did.
It's a tough question to answer, even if you're not a young child, because we don't really have a definitive answer.
However, when young Otis 'stumped' his mother with the bedtime teaser, she decided they should write to a man who is at least well qualified to have a guess: Sir David Attenborough.
The 94-year-old naturalist and TV presenter has spent his life studying the natural world, giving particular attention to animals, dinosaurs, and humans, so the pair decided to get in touch.
To their amazement, a handwritten letter plopped onto their doormat some time later - it was Sir Dave responding to Otis' query.
Attenborough wrote: "The answer is that we need not do so as long as we look after our planet properly."
Gerry, Otis' mum, said that when she was posed the question she decided that 'honesty was the best policy' and simply explained that she didn't know.
Speaking to BBC News, she said: "I said I didn't know the answer - but I hoped not. So I told him about climate change and how we need to look after our planet.
"We also talked about the work lots of amazing people, like Sir David and Greta Thunberg, are doing to make sure people are taking action to make a difference."
"When I explained about global warming, his little eyes were on stalks, but I tried to focus on the small things we could do to help like recycling our rubbish, driving the car less and eating less meat."
The next day, they put together a letter, complete with a card and a dinosaur drawing, and sent it off.
Three days later, they got their reply.
Gerry continued: "There's something really special and poignant about a 94-year-old conservationist, who has spent his life working to save the planet, corresponding with a four-and-a-half-year-old who's just at the very beginning of his journey to understand the impact of climate change and our behaviour on the planet.
"I think it's so important that kids learn from a very young age about what's happening and the action we need to take."
Obviously, Otis was overjoyed to get a letter back, even if he is yet to fully grasp the significance of it.
Gerry added: "His little face just lit up when I read the letter to him this morning. He knows who Sir David is and that he's special - but I think he'll need to be a bit older before he really understands the significance.
"Sir David is just a wonderful human being. He's worked so tirelessly to help us all understand our own impact on the planet and how important it is for us to take action now.
"He has that innate ability to inspire and engage people, whether it's speaking at UN climate change talks or writing to a young boy about the dinosaurs. He's a national treasure who has inspired generations."
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