We are big fans of Usborne Publishing around here.
Quite a few of their colouring/activity/puzzle/sticker books have found a happy home on our bookshelves, in fact I have my very own colouring book of patterns that the kids know they are FORBIDDEN to touch. So when Granny gave Leo this set of 50 science cards we were all smiling.
On weekends I can sometimes be an organised parent, suggesting that the kids find an experiment which we can create together. The latest one is the 'growing bicarb crystals' card, actually we've been letting them grow for about a month.
This is the day after we set up the tray. The water drips onto the plate from the lowest point of the woolly 'skipping rope', and you get different crystals forming on the plate.
Next time we might put food colouring in each jar, maybe a different colour in each, to see what blends we get along the woolly rope. I'll be sad to dismantle this experiment but there are so many more to make. I'll keep you posted.