Our laboratory experiments and numerical simulations of stratified tidal flow past model topography
a half sphere on a horizontal plane reveal several three-dimensional flow features, including an unexpected flow perpendicular to the forcing plane
the vertical plane through the center of the sphere,...

The force field of optical tweezers is commonly assumed to be conservative, neglecting the complex action of the scattering force. Using a novel method that extracts local forces from trajectories of an optically trapped particle, we measure the three-dimensional force field experienced by a Rayleigh particle...