Scientists have recorded footage of atoms bonding for the first time. The possibility of being able to film them seemed almost impossible. At lengths of between 0.1-0.3 nm, chemical bonds are about half million times smaller than the width of a human hair.
If you put some soap or ink on a leaf, you obtain a ink propelled boat, using the Marangoni effect. The ink or the detergent has a lower surface tension than water and its flow provides thrust to push the boat forward.