Why did the dinosaurs disappear? 恐龙为什么灭绝了？

Together, we discover that pain isn't the enemy — it's actually your body's alarm system, sending signals through tiny nerve "wires" to your brain in less than a second to say something's wrong. We also learn what happens to people who are born unable to feel pain at all, and why that's far more dangerous than it sounds. 我们会发现，疼痛其实不是坏人——它是身体的警报系统，透过神经这些细细的"电线"，在不到一秒钟的时间里，把信号送到大脑，告诉你哪里出了问题。我们还会认识那些天生感觉不到疼痛的人，了解为什么这其实比听起来危险得多。 Perfect for little listeners aged 5–8.

Together, we discover that baby teeth were never meant to stay forever, what's really happening under the gums long before a tooth ever falls out, and the animal that grows thousands of teeth in its lifetime. 我们会发现，乳牙其实从一开始就不是要一直留着的, 还有，在一颗牙齿真正掉下来之前，牙肉底下到底发生了什么事，以及有一种动物，一生中会长出成千上万颗牙齿。 Perfect for little listeners aged 5–8.

Together, we discover that the world is home to thousands of different languages, why a mountain or an ocean between two villages can eventually turn into two completely different ways of speaking, and how one small country ended up with more languages than almost anywhere else on Earth. 我们一起发现，世界上原来有成千上万种语言，为什么一座高山或一片海洋，隔在两个村子之间，久而久之会变成两种完全不同的说话方式，还有一个小小的国家，为什么最后拥有的语言，比地球上几乎任何地方都多。 Perfect for little listeners aged 5–8.

Together, we discover that a dog's tail can tell a completely different story depending on how fast it moves, how high it sits, and even which side it swings toward, and why a wagging tail doesn't always mean a happy dog. 我们一起发现狗狗的尾巴摇动的速度、高度，甚至摇向哪一边，都藏着不同的意思，而摇尾巴并不代表狗狗一定很开心。 Perfect for little listeners aged 5–8.

Together, we journey beneath the Earth's crust to discover the scorching layer where rock melts into magma, how pressure builds until it finally breaks through, and the surprising truth that some of the most active volcanoes on Earth are hiding deep underwater. 我们一起踏上地壳之下的旅程，去发现那灼热的地层——岩石在那里熔化为岩浆；压力如何不断积聚，直至最终冲破而出；以及一个令人惊讶的事实：地球上一些最活跃的火山正深藏于水下. Perfect for little listeners aged 5–8.