If your child is interested in becoming a scientist, then she or he should check out the I Want to be an 'ologist page at the Natural History Museum. Learn about a paleontologist (Andy Ross), an entomologist (Zoe Adams), a mineralogist (Mike Rumsey), a zoologist (Miranda Lowe) and a botanist (Mark Spencer).
Wow, I wish I had been able to see information like this when I was a kid. Although if I had read the one about the entomologist I might never have become one 🙂
If you don't see the 'ologist your child is interested in, leave me a comment and I'll try to find you someone appropriate.