Aleksander Popel and his colleagues at Johns Hopkins University in Baltimore are building a model of the micro-vasculature to get a better understanding of how molecules and cells interact in these narrow channels where physical experiments are hard to perform.

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Failures re-price their assets (human and physical) and try other experiments but the whole process supports tens of millions of workers who gain experience and incomes.

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"This is a very exciting set of experiments, " added Helen Fielding, a physical chemist from University College London.

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