Yep, that's what we appear to be doing. After our venture into cells here it seemed logical to carry on.
It all arose out of a desire (mine) to take our everyday-as-it-happens science up a notch or two.
My hunt for a one-stop suitable book or resource - something between text book and popular science, with sequential and relevant experiments, clear diagrams and a host of other requirements - has, not surprisingly, been unsuccessful.
And so we have resorted to our usual mish-mash of resources, researched, cribbed and squidged together as a higgledy piggledy selection of podcasts, old pre-curriculum science books, webpage printouts and BBC video clips.
First we looked at transpiration and the flow of water up plant stems. The conversation went something like this:
Dh: "Celery? But I thought you didn't like celery?"
me: "I don't. It's for science."
Dh: "Oh. Right."
He looks at me strangely. This is the man who made gunpowder in our back garden for ds1's 7th birthday. Who used liquid nitrogen and orange juice to make orange sorbet for our barbecue. Nuff said.
Anyway, the old 'celery in a glass of coloured water trick' (btw only one stick is required, not the whole blooming lot).
Et voila! Blue dye seen in celery slice. Now that was worth £1.15 at the greengrocers.
Then we look at osmosis. You know, the passage of water through a selectively-permeable membrane from a place of low solute concentration to high solute concentration. [Just look it up in wikipedia]
ds2 cuts 2 potato slices:
Yep, like that.
One slice is added to plain old water.
The other slice is added to water with a big load of salt dissolved in it.
After an hour or so, the slice in the salty water should go floppy as water passes from the potato into the water, and the slice in the normal water should go hard as water passes into the potato. Or something like that. You get the gist.
And what to do with all that leftover potato? An impromptu opportunity for potato sculptures, of course.