stephanie's off, i've got catherine rampal, thank you for doing it. >> of course. >>> new challenges in health come with people suffering with diseases associated with aging. for some of the big names in the health care business, that is the biggest challenge of our time. >> reporter: researchers and scientists are receiving tens of millions of dollars from tech giants. the x-prise foundation is a nonprofit that hosts public competitions that aim to tackle some of the globe's biggest challenges. last year some of his organization honored scientists pushing for a breakthrough in alzheimer's treatment. one doctor has pioneered the use of stem cells to treat a range of diseases. now they're coming together to form celularity, a new company which is harvesting stem cells from discarded placentas. the stakes couldn't be higher. by 2030, one in five americans will be over the age of 65. as humans live longer, the diseases of aging will impact us all. >> joining us now are these two guys who i admire a lot, the executive chairman of x-prise and the founder and chairman of celularity with pe