Going to conferences induces some costs on a researcher's personal budget. In all places I know, expenses directly related to travel and accommodation are usually covered (travel, hotels, food), but there are also some indirect expenses that aren't typically covered.
I'll only give one example, that is directly applicable to me: when I'm away I have to get a baby sitter for the kids (for the days where my wife can't pick them up, say). However, I'm sure there must be other examples.
Are there institutions that cover these “hidden” (or indirect) expenses? What rules do they follow? It must be difficult to know where to put the limit… (“hey, I'm going on a conference in Sweden in December, which means I have to buy myself a new coat! can I get it reimbursed?”)