Superman Science by Agniezka Biskup and Tammy Enz
Pop culture characters are a decent way to engage reluctant readers in non-fiction topics. It's easier to get a kid to consider all of the elements that go into flight, both by animals and humans, if you can compare it to how Superman flies. While there isn't a great deal of detail in this book, it does give the reader quick tastes of science in a wide variety of topics, hopefully enough to intrigue them and cause them to read a more in depth book on one of the specific topics. In addition to the wide variety of topics represented, there are a lot of images and the pages are designed in such away to move the eye along.