I have Tall Small with me today - she had a tummy bug which is all better now but our school sensibly has a 24 hour quarantine policy after little ones stop throwing up, so she is feeling fine but stuck with me.
What to do? We've done multiplication squares and fed the birds, and then she asked to 'do some science'. Well, am I likely to say no?
So, here's a old but good recipe to entertain a small not-very-ill person:
Take one glass and fill with something clear and fizzy - we used tonic water but lemonade or soda water would be fine too.
Add a raisin.
Watch as bubbles of carbon dioxide form on it and carry it up to the surface. The bubbles will burst and the raisin will fall, and then rise again, and fall again over and over till the liquid goes flat.
And if one raisin is fun, why not try a handful?
Just don't try to drink it afterwards ...
Edited to expand the science bit:
Fizzy drinks fizz because the CO2 in them only stays in solution whilke the drink is under pressure in the bottle or can; when you open the can the CO2 comes out of solution and escapes as bubbles of gas. The raisin - or indeed anything else - forms a nucleation point for the bubbles to get caught on. Once enough bubbles are formed on the raisin, it becomes buoyant and floats up to the surface. When the bubbles reach the surface of the drink the CO2 can escape into the air and the forces holding the raisin up are overcome by gravity so it sinks again. Hope that's a bit clearer!