How to move against the current? One answer is
’tilt’-illating

Going upstream, and against a current, involves a
front-first downward tilt and then moving along a surface, shows
new research by a team of scientists, which created “nano-motors”
to uncover this effective means of locomotion under such
conditions. Its findings and the creation of these tiny motors
offer new insights into the nature of movement in fluids and have
implications for engineering.