All mammals have mammary glands that produce milk^[1], a feature that has fascinated scientists for many years. Questions such as why mammary glands evolved in the first place, how they have adapted across different species and what unique evolutionary pressures shaped their development remain largely unanswered.

To investigate how various...

Curious Kids^[1] is a series for children of all ages. If you have a question you’d like an expert to answer, send it to This email address is being protected from spambots. You need JavaScript enabled to view it.^[2]. Do dinosaurs still exist in some parts of the world today? – Ruben M., age 5 Did all dinosaurs become extinct, killed when an asteroid hit the Earth 66 million years ago? Or

At Cambridge University Library^[1], along with all the books, maps and manuscripts, there’s a child’s drawing that curators have titled “The Battle of the Fruit and Vegetable Soldiers^[2].”

The drawing depicts a turbaned cavalry soldier facing off against an English dragoon^[3]. It’s a bit trippy: The British soldier sits astride a...