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When we were kids, you could do stupid things and, if you absolutely needed them to be left behind, you moved away and never spoke to your old friends again.   Now stupid things end up on YouTube.  Forever.

What if you don't want your college-era rants showing up in a job interview?  

University of Washington researchers say they have developed a way to make online information expire. After a set time period, electronic communications such as e-mail, Facebook posts and chat messages would automatically self-destruct, becoming irretrievable from all Web sites, inboxes, outboxes, backup sites and home computers. Not even the sender could retrieve them.
Don't get Michael Schumacher or Jeff Gordon on the phone yet but we could one day be driving on tires made from trees.

Wood science researchers at Oregon State University say they could cost less, perform better and save on fuel and energy, though has any researcher not said that exact same thing about every R&D project they are involved in?  
Epidemiological studies have shown that some oral contraceptives are less effective at preventing pregnancy in obese women until an 'effective blood concentration' has been reached, meaning there is a 'window' where the contraceptive will not be effective in heavier women.

With estimates  that up to 30 percent of adults in the U.S. are obese, this could be important.   Fixing contraceptives is an easier path than telling people to eat less while simultaneously telling them that society's unrealistic body images should be resisted.
Researchers writing in Proceedings of the National Academy of Sciences say they have discovered that the sea lamprey, which emerged from jawless fish first appearing 500 million years ago, dramatically remodels its genome. Shortly after a fertilized lamprey egg divides into several cells, the growing embryo discards millions of units of its DNA - one fifth of its genome. 

Mayo Clinic investigators say a proof-of-concept study has demonstrated that induced pluripotent stem (iPS) cells can be used to treat heart disease.  iPS cells are stem cells converted from adult stem cells so don't involve the ethical concerns involved in using human embryonic stem cells.

In their study, the researchers reprogrammed ordinary fibroblasts, cells that contribute to scars such as those resulting from a heart attack, converting them into stem cells that fix heart damage caused by infarction.

This is the first application of iPS-based technology for heart disease therapy. Previously iPS cells have been used on only three other disease models: Parkinson's disease, sickle cell anemia and hemophilia A.

Neanderthals were stoutly-built and human-like and lived at the same time and in the same areas as some modern humans.  But they went extinct.

Anthropologists have tried to solve the mystery of Neanderthal's fate since the first fossils were discovered in the small valley of the river Düssel called Neandertal, about 7 miles east of Düsseldorf in Germany.

Speculation is they they inter-bred with modern humans or failed to compete for food or resources  or perhaps were even hunted to extinction by humans.