When five-year-old Toby asked his mum, "Can I write a letter to the world?" she never imagined that a little summer project would turn into a two-year challenge, leading to news stories across the globe. Toby has now written, with the help of his mum, Sabine, letters to all 193 countries, and all the US states. Toby loves learning at school and is keen on archaeology, history and, particularly, fossils.