FDNY on Instagram: "Seeing double? New York City is proudly protected by siblings across the department—including twins. The Ahlers brothers represent a family with a long-standing tradition of service, with their father, mother, grandfather, and uncle all having served the city. Happy National Twins Day from the FDNY!"

Can Quantum Physics Solve Science’s Biggest Mysteries? | FULL DOCUMENTARY

The mind-bending reality of quantum mechanics - with Jim Al Khalili