Re cooking...I think that children who spend time in the kitchen and watch meals being prepared from scratch (it's only recently I've learnt that meals can be prepared in other ways as I've kept my mother's practices: to me, home cooking = scratch cooking) absorb this knowledge until it seems to be so basic that it's not knowledge.
For instance, husband was shooed out of the kitchen when he was growing up and although his mother cooked, mainly from scratch, he has no idea about the order in which to do things to save time and/or ensure everything is on the table at the same time. He has a very limited repertoire of recipes he knows without looking at a book, whereas unless I'm baking (and I know three or four cakes off by heart too) I'm happy to cook from whatever is in the fridge and wing it. There are basics that I just *know*. Like I know how to walk and talk. These things are mostly traditional English staples, but with that confidence behind me I can pick up a recipe book for inspiration or simply look at what's available and work from there. Those are learnt skills, but were they were learned by osmosis when I was small.