They justify it by saying that feedback doesn't apply to them they aren't as likely to die before 60 as other people, for instance, because they have grandparents who lived into their 90s, or because they are avid gym goers with low blood pressure.

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In the case of the Mississippi baby, we know she was exposed to HIV, had HIV in her blood, and that at least some cells in her blood were found with sleeping virus though we will likely never know if those cells were from the child or maternal cells that had been transmitted during pregnancy or birth.

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Employing it in adult mice not only led to blood vessels that have lasted so far for over a year, but the blood vessels themselves are now surrounded with muscle tissue meaning that the body is able to use those vessels to properly regulate blood flow.

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By the 17th century, the walls of the court were painted with a noisome cocktail of ox-blood, ox-gall, lamp black and a bucket of urine: soon afterwards, tennis became unfashionable and all but disappeared to be revived as a modified, open-air sport, in the wake of the invention of the lawn-mower, by Major Wingfield in the 1870s.

ECONOMIST: History of the net

Topping up the supply of healing fluid might be done by mimicking another biological system the network of blood capillaries that supplies living tissues with the stuff they need to thrive.

ECONOMIST: Monitor

Existing models are based on indirect measures of how infectious an animal is a cow with high levels of the virus in its blood, for instance, is assumed to be able to infect other animals.

ECONOMIST: Foot-and-mouth disease

They came up with a promising candidate, tweaked it so it would be absorbed in the blood as a pill and then performed the key experiment testing it in mice to see if it would shrink tumors.

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