Science Friday was awesome! We generally do a Science Tuesday twice a month, but due to a drama class at the same time for my Kinder we through one on the calendar for Friday. Our science day is basically CJ's science curriculum for the Kindergarten year. Science happens to be awesome as a big group activity, so we always set it up so that our homeschooling group can join us.
We often use ideas from one of the Mythbusters Science Fair books. One of the items that was tagged by CJ was catapults. We started the day watching 2 episodes of Mythbusters before our friends came over. They were both based on catapults. They often have 2 myths paired together so we skipped over the parts that were about the other myth and only watched the catapults parts. When our friends came over we watched a short video about a catapult that explained what they do. (*Watch out for the ads at the beginning and the end. There is also a naughty word in the middle that I muted while the kids were watching it, so watch it first if that is a concern for you.)