Kitchen Science
While Dave worked at the Naked Scientists he built up a huge collection of hands-on science experiments to do at home.
It started as a weekly segment in the radio show which varied from toaster hot air balloons to making a functional chocolate teapot (it doesn't work well, but better than you would think). Dave wrote up the experiments, and they have had millions of reads over the years.
You can still read the kitchen science experiments on the Naked Scientists website.