Whyzz website, children's why questions

This website is really useful, I get why questions daily (and what/when/who/where/how...) so on my many google searches I came across this website http://www.whyzz.com/index/home
Rather simply, you type the question and it gives you a simple answer plus some activity/further research ideas on the subject. If you join the site you can contribute, comment and share. There is also a phone app that goes with it and I must confess I have used it a few times!