“Former vice president Joe Biden is now the presumptive Democratic nominee for president — after a primary involving months of campaigning, 28 Democratic candidates and over $1 billion in ads," he writes. "Did any of that affect the result? Not much, our research suggests — but they weren’t meaningless.”
NASA/JPL-Caltech/ESA/CXC/Univ. of Ariz.
A superdense neutron star is spewing out a blizzard of extremely high-energy particles into the expanding debris field known as the Crab Nebula.
