Jamie: what do we have to prepare for our biology classes?
Oliver: we have to make an experiment?
Jamie: what kind of experiment?
Oliver: just an experiment
Jamie: at the classes or at home?
Oliver: at home
Oliver: you can for example take care of plant and compare it with one without sun and water
Jamie: but it takes time to see the difference
Jamie: and the classes are tomorrow
Oliver: so you can explode something
Jamie: like what?
Oliver: you know, this trick with cola and mentos
Jamie: what's that?
Oliver: look at the youtube
Jamie: it seems dangerous
Oliver: it's not, but it's dirty
Jamie: i need something else
Oliver: i have no other ideas
Jamie: ok, i will ask my sister if she had something like this last year
Oliver and Jamie have to conduct an experiment of their choice as homework for the biology class tomorrow. Jamie will ask his sister for advice.