I designed this scientific investigation for my third graders this year. In groups of 3 or 4, students will make a hypothesis about the number of seeds in their pumpkin, measure the circumference, weight, height, and whether it sinks or floats (data section), record the properties of their pumpkin (color, texture, shape), and then finally cut open the pumpkin and count the number of seeds. To help with management during the measuring process, there is also a pumpkin design page that groups can work on when their done and decide how to carve their pumpkin's face at the end. This is a 2 or 3 day activity. Day 1 is the introduction and teaching students about the scientific method, Day 2 is all the measurements, and Day 3 is the cutting open, seed counting, making a bar graph of the class data and jack-o-lantern carving. At the end of the day, I will put battery candles in the jack-o-lanterns and read Halloween stories as a final Halloween celebration. Have fun and Happy Halloween!