1. Pour some full cream milk into a dinner plate 2. Squeeze some drops of food dye into the milk (one colour on one side, other colour on other side) 3. Add a drop of detergent onto the edge of the plate so it runs down into the milk 4. The colours begin swirling like a psychadelic pattern 5. You can add more detergent if the motion stops
Explanation [The explanation in the above video is incorrect]
Like milk itself, this classic experiment is actually quite complicated. Milk is a suspension of tiny fat globules (about 4% by volume) in water, plus a whole range of proteins, sugar (lactose) and nutrients like calcium. Detergent is a form of surfactant (short for surface active agent) - individual detergent molecules can bind with both water and oil.
The swirling effect in milk is probably driven by the detergent molecules racing around and coating the fat globules. As the detergent molecules are "consumed" by the fat, they create currents. You'll notice colours from the opposite edge of the plate appearing near the detergent and then shooting across the surface.
Summer vacation in the northern hemisphere still havs plenty left to do some interesting project. If you like challenge, here is a good one.
Choose a person (or object) which you like, convert into low resolution and in six colours. Assemble the picture using Rubik's cubes. Sound difficult? Here is an example.
An awesome 100K by 100K artwork. Few more examples:
Vexel Art:
From Wikipedia:
Vexel is a neologism and portmanteau for an entirely pixel-based raster form of digital art that imitates the vector graphics technique. The word derives from a combination of "vector" and "pixel" to distinguish them from normal vector graphics and normal raster images.
A little science project (good for those schools in Northern Hemisphere: Summer) using dry ice.
Warning, dry ice is cold to the touch and can hurt you if used inappropriately. Please exercise caution when working with it, wear proper safety protection, and use it responsibly.