“Beneath all the hype is some striking science. Blood, particularly the yellow liquid part of it known as plasma, is chock full of proteins and other compounds that act like a readout of how all the cells in the body are functioning. Research has shown that the ratios of those components change as animals, including humans, age. Older blood carries more signs of tissue damage than young blood.” Wired: Startups flock to turn young blood into an elixir of youth. (Silicon Valley startups focused on blood…what could possibly go wrong?)