All of the ones for slime, horrible experiments, science kits etc. have a boy scaring his sister (and quite often the mother too) with his 'creation'
Reinforcing the idea that: girls have no sense of humour and don't like gross stuff (try telling that to DD)
There's a particularly awful one with a girl dressed head to toe in pink, disgusted at her brother making some horrible experiment
My dd loves all of this stuff, just the same as her brother, so why is she excluded in adverts?