More summer experiments

Here we have two more experiments from Polly, the prolific experimenter, is there no limit to her work, and Ollie's first offering. Where Polly is going for quantity Ollie has added loads of detail and so looks like the quality contender.
https://www.dropbox.com/s/dc7ly5025jrimof/Polly%27s%20SCIENCE%20BALLOON%20AND%20PENNY.pdf
https://www.dropbox.com/s/9jxlrbyfhikcg19/Polly%27s%20VOLCANO%20EXPERIMENT.pdf
https://www.dropbox.com/s/hnuuvbhxrop00md/Ollie%27s%20Science%20Experiment.pdf

Come on the rest of you