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A simple blood test was able to predict who would get alzheimer's. >> it's a wonderful piece of scien science, the most significant observation that we've been able to report in my entire scientific career. >> reporter: the researchers looked at the blood of healthy elderly people, checking for ten fatty molecules called lipids. those with lower levels of lipids, were more likely to develop alzheimer's or memory problems that precede alzheimer's. on average the change from healthy to sick took two years. the test was over 90% accurate. researchers and alzheimer's association point out more stu...

Whose brains will get the plaques and tangles that destroy concentration and who will be spared. in a first of its kind study, a simple blood test was able to predict who will get alzheimer's. >> this is a really wonderful piece of science, the most significant observation that we've been able to report in my entire scientific career. >> reporter: the researchers looked at the blood of healthy elderly people, checking for ten fatty molecules called lipids. those with lower levels of lipids, were more likely to develop alzheimer's or memory problems that precede alzheimer's. on average the chan...

The united states, nato and afghans are there to finish the job. >> now to the gulf oil disaster, a test is being conducted on what's being built on the world's largest oil skirm called the a whale. if the test works, this could get rid of a lot of oil. on board the skimmer today, he joins us now from louisiana where thankfully the rain died off a little bit. tell us about that excursion. >> reporter: fredricka, we overflew it out at sea, testing the maneuverability. the reason there is so much optimism is a ship that is registered to the taiwanese. it came over from europe after being retro f...