Ice cream

Did you know that ice cream consists of around 5% fat, 15% matrix, 30% ice, and 50% air?

I was at a material science talk earlier today and this is one of the things that we were discussing 

Also ice cream from an ice cream van sort of thing is softer than store bought because it's generally fresher so the ice particles and air sacks are smaller. They get larger over time because they use less energy when in a larger mass so move to form larger ones

Not very well explained because I'm tired and there is a child screaming and quacking down my ear but I tried