There's an interesting #quantum field theory where the photon has nonzero mass m proportional to the charge e of a fermion: m² = e²/π. Namely, in 2-dim'l quantum electrodynamics of a massless #fermion. In 1962 Schwinger showed this result is exact. #Physics
A coyote and a badger use a culvert as a wildlife crossing to pass under a busy California highway together. Coyotes and badgers are known to hunt together.
🎥Peninsula Open Space Trust
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Tonight is the night! The #Perseids meteor shower, caused by debris left behind by the Comet Swift-Tuttle, peaks overnight tonight! Get outside to watch with your own eyes or tune into our Facebook Live stream starting at 8pm ET: https://t.co/drc8U531yG
His passing has left an intellectual vacuum in his wake. But it's not empty. Think of it as a kind of vacuum energy permeating the fabric of spacetime that defies measure. Stephen Hawking, RIP 1942-2018.