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U.s. today, 30 million people are under heat advisories and excessive heat warnings. this week temperatures in california's death valley rose to 128 degrees. that is six degrees shy of the hottest recorded temperature on earth ever. nbc's weather unit forecast the heat will break in the coming days, but research out this week reveals what could be behind these high temperatures. a new study shows the amount of heat the plant traps has roughly doubled since 2005. the unprecedented increase is contributing to rapidly warming oceans and air and land. researchers used satellite data to measure wha...

A record-breaking heat wave continues in the southwestern u.s. today, 30 million people are under heat advisories and excessive heat warnings. this week temperatures in california's death valley rose to 128 degrees. that is six degrees shy of the hottest recorded temperature on earth ever. nbc's weather unit forecast the heat will break in the coming days, but research out this week reveals what could be behind these high temperatures. a new study shows the amount of heat the planet traps has roughly doubled since 2005. the unprecedented increase is contributing to rapidly warming oceans and a...

The hypothesis which says that a species has a relatively fixed rate of ageing from adulthood. the conclusion? that we're unlikely to be able to manipulate that process because of biological constraints. here to explain more is study author susan alberts from duke university. thank you very much forjoining us. i'm a little bit confused because we are living much longer, aren't we? so what is to say based on your research that at some point in the future we may not find the magic pill that allows us to live forever? thanks for having me. i don't want to crush _ thanks for having me. i don't wan...

Points to our low pay and as with police departments in the military, the teaching profession may suffer when unemployment was low and other jobs are plentiful. worsening teacher retention rates, having to teach to the test and burnout and stress especially in low income areas. still, a lot of people are taking the economic policy study with a very large grain of salt. one special interest watchdog says that things take has an agenda and that it receives a large portion of its funding from organized labor. >> years ago, special interest groups like teacher unions were saying there was a teache...

In as black and white a sense of, were votes changed, sort of misses the larger impact. >> that's right. we forget in total -- this study was one part. russia really did three things that any other american political campaign could not do on their own. they hacked and released information that drove the mainstream media narrative around the election. the second thing is they could time the release of the hacked material. just one example, the access hollywood tape came out that was really damaging to donald trump within less than an hour wikileaks started dropping emails that changed the narra...