Physicists have theorized for over a century that light acts as both a particle and a wave, depending on the conditions, but they‘ve never been able to capture it being both at once — until a team in Switzerland did just that in a recent experiment. Scientists at the Ecole Polytechnique Federale de Lausanne managed to take a snapshot of light in all its elusive wave-particle duality, a form first proposed by Einstein in 1905.