Tinker Crate is a monthly subscription service, delivering cool toys to encourage engineering-style skills in kids aged 9 to 14. Instructions are included, but they also produce slick videos like the one above to further engage little minds. Project kits include parts and diagrams to make a trebuchet in one month, and a simple motor the next.
The site doesn't list more projects than that, but since they're offering subscriptions up to 12 months, we'll just have to sign up and be surprised.
Tinker Crates is just one brand in the Kiwi Crate family, who offers several other subscriptions: Koala Crate, an art project box for kids 3-4; Kiwi Crate an arts & crafts project box for kids 4-8 and Doodle Crate for kids 9-16, with more sophisticated projects and older kid appeal.