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!"

Quantum Computing & Tech ⚛️ on Instagram: "The double-slit experiment is a key demonstration in quantum physics that reveals the strange behavior of particles like electrons and photons. In the experiment, particles are fired at a barrier with two slits, and a screen records where they land. If both slits are open and no measurement is made, the particles form an interference pattern, like waves overlapping, even when sent one at a time. This suggests that each particle passes through both slits