A new study indicates that crews with a wider range of personalities perform better under pressure, possibly informing how NASA selects and trains its astronauts for future missions to Mars.
The Big Bang essentially created two elements: hydrogen and helium. It also produced tiny traces of lithium and a few other light isotopes, but in the beginning there was hydrogen and helium. All the other, heavier elements formed later, either in the cores of stars, through stellar collisions, or other astrophysical processes. Even now hydrogen and helium make up so much of the material world that astronomers refer to all other elements as metals. Dust in the wind, you might say.
