This is the title of a book we've had for a few months containing the science behind some fun experiments. Ali decided it might be interesting to incorporate some into this afternoon's homeschool. Luckily for Dougal the instructions for turning small furry rodents into rock seemed like too much hard work, so we picked another experiment instead.
No...he's not trying to drown Freda. This is how to measure the weight of a human head. Fairly messy - with buckets, basins and water sloshing about everywhere. The bucket proved to be too small for Ali's large brain so Freda was the guineapig instead, with Edie on photography duty. Assuming water has the same density as human brain tissue and skull (is this assuming too much?) then Freda's bonce weighs in at about 2.8kg. Experimental error was fairly high - we're not sure of her head was completely submerged (was Ali pushing hard enough?). Afterwards, another experiment, we played about with cornflour mixed with water - now that really was fun (and very messy).
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