Over the past few weeks, aircraft engineers have found they do not know quite as much about metal fatigue as they thought.

ECONOMIST: Aircraft fatigue

"It's quite deceptive to those who do not know the history, " says Wimar Witoelar, a political commentator and leading member of the reform movement.

CNN: Golkar Stirs the Party Pot

The literature on similarities and differences between ES cells and iPS cells, he said, is quite controversial and scientists still do not know whether differences between different iPS cell lines are just due to genetic differences between the adult cell lines that were used for reprogramming or whether genetic changes occurred during reprogramming.

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So far, people are saying that they have not the confidence, they do not know who is going to win this fight and right now they are not quite ready to show their cards.

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For example, we do not know how much Iraqi oil production will increase this year, although it seems quite likely that it will.

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When assigned to random groups to select music with people you do not know, for example, you will collectively create a shared favorites list that is likely to be quite different from the lists of all other groups that might form for a similar task.

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