My 6 yr old daughter is very curious about science and is always asking me questions, which I can't ever answer. I suggested that she create her own blog and post her questions and thoughts on it and perhaps she will get feedback. She came up with the name of the website herself.
It's Science Wonders for Kids at http://sciencewonders4kids.blogspot.com/.
We still need to fine tune the site, but she still wanted to post some of her recent questions.
Please check it out and if you or your kids know any of the answers, she would love to hear from you.