Chocolate M&Ms are covered by a layer of sugar and food colouring. When put into the water, the sugar gradually melts taking with it a certain amount of colouring which, in its turn, is also soluble in water. The sugar flows in the water from areas with a high concentration of sugar to areas with a lower concentration. At some point, the colours do not not mix anymore! A possible explanation is that in the border area between then, the sugar concentration is almost the same, diminishing the tendency of both the sugar and colouring flux.

Making soap bubbles makes any outdoor activity much funnier – specially if there is a smooth breeze to take them to the sky. The size of both the soap bubbles or the huge tubes depends on the used materials as well on the students’ expertise. The soap bubbles have no colour, but their amazing structure and the light properties make visible a complete rainbow. The outer surface that keeps the air inside is a thin water sheet isolated between two thin layers of soap molecules. It’s the way the light interacts with these layers that creates the colours we can see.

Adjective. not lasting, enduring, or permanent; lasting only a short time; existing briefly. Philosophy. person or thing that is transient, especially a temporary guest, boarder, laborer, or the like. Electricity. a sudden pulse of voltage or current

Fidget spinners work because there is a bearing in the centre. This is a good example of conservation of angular momentum, essentially the thing will keep spinning until there is an external moment, this is provided by the friction between the two rings. Ball bearings in between the two rings mean that as small as possible surface is touching between the two rotating rings, meaning friction is as low as possible. Skateboards, rollerblades, bikes and cars are all designed to waste as little as possible energy as heat and sound during friction between the axle and the wheel.

A short video describing why and how hydrocarbons (crude oil, natural gas) may or may not be found in hydrocarbon traps in lower geological strata

Project Lead the way: Women constitute 48% of the US workforce but hold only 24% of the STEM jobs. Today's girls are tomorrow's engineers, as they naturally possess the creativity and analytical and communication skills to become one!

A crush course on why though the elements had been categorized according to their properties before, it is Mendeleev's periodic table that survives to our days.

A short presentation on how cancer cells develop and what cancer is.

Math games... and not only.

This powerful film from MullenLowe London provocatively captures how, early on in their education, children already define career opportunities as male and female. When asked to draw a firefighter, surgeon and a fighter pilot, 61 pictures were drawn of men and only 5 were female.