I've really enjoyed all the content from JPL NASA. The instructions are good and thorough and the concept is really fun. It's also a great way to sneak in a small history lesson about the moon landing. Some of the materials might not be as readily available as we may want them to be (for example, I don't keep plastic straws in my house, so I had to improvise with small, rolled up papers), but I really recommend this activity for it's learning potential and fun!