It’s the… it's the business of making reproducible observations which can be done by other people. They’re not necessarily repeatable because sometimes it’s unique observation, but it may be a one of a similar type, as when you look at one star and then look at another star, for example. It’s making observations. It’s setting up some theoretical model of what is happening, which… in nowadays, in these mature sciences, is usually related to other scientifically established things. It’s not in isolation. And then trying to make further observations or do experiments, if you can do experiments, to try and confirm or… or disprove these… these general ideas. And I don’t think you normally do that when you look at it… when… when…. that’s not the way the ordinary… most things are done.