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56 hours until the polls open with a leader is campaigning for every single one of your votes, but what is really going on behind—the—scenes? welcome to newsnight, for your nightly interviews and insight. and we will bring both to you on the week when you decide who's going to run our country for the next five years. tonight, we have the man who compiles the exit poll which you will see at 10pm this thursday on the bbc one election programme, professor sirjohn curtice. that should give you — us, we hope — the first accurate forecast of the election result. we also we have har...

To just a few drops. i'll let her explain. >> people don't like big needles being stuck in their arms. and so part of our work has been -- >> reporter: so because they don't like that, they tend to not have their blood tested often enough? >> exactly. exactly. >> reporter: i mean, your basic thesis is that if we could have much more testing of blood, we would find out about these diseases or potential diseases much earlier. >> exactly. >> reporter: so why do we give so much blood? i think everyone who's ever had a blood test does wonder, why do you need so much blood to, you know, figure out y...

Diseases or potential diseases much earlier. >> exactly. >> reporter: so why do we give so much blood? i think everyone who's ever had a blood test does wonder why do you need so much blood to you know figure out your cholesterol or whatever it is? >> the whole system has been designed around that. so since really the 1960s when the clinical lab infrastructure began to develop we've had this infrastructure that's very similar to what you see in mainframe computing where you have highly centralized, very big analytical instruments which require that much blood. and therefore, people have had to...