Something that explains the attraction found in drops of food colouring.
“ The critical fact was that food colouring is a two-component fluid. In such fluids, two different chemical compounds coexist while retaining separate molecular identities.
The droplets in this experiment consisted of two molecular compounds found naturally in food colouring: water and propylene glycol. The researchers discovered how the dynamic interactions of these two molecular components enabled inanimate droplets to mimic some of the behaviours of living cells.
This complex behavior is something called artificial chemotaxis which Manu Prakash explains in layman’s terms in the video below: https://www.youtube.com/watch?v=ZMsaH6SY4CY
The physical properties of these fluids give rise to this immense complexity of behavior. For example, chasing and sensing each other, and very much what we call artificial chemotaxis.
Chemotaxis is the idea in biology that one single cell can sense where its enemy is, and it brings up all its machinery, and it chases that enemy to try to eat it.”
Source & credit: http://goo.gl/s2MbG1 #scienceeveryday #sciencesunday