This swimming eel-robot was made by a Norwegian company called Eelume. The idea is that they’ll develop these robots to live on the seafloor, cleaning and keeping check on undersea equipment and performing simple tasks like tightening loose valves with their clamp-like mouths. (Source)
The fuse sets off a charge, which ignites the gunpowder. This
propels the firework into the sky.
Once the firework is in the sky, the gunpowder within the
firework ignites. This causes the ‘stars’, which contain metal
salts and iron filings, to explode in different colours and
sparkles. If the firework is in sections, the tars can be in
different compartments. These compartments explode at different
times, making different patterns.
The pattern of stars around the central gun powder charge
creates different patterns of fireworks. For example, if the stars
are in a circle around the black powder charge, you get a circle
display of colour. One mistake in the placing of the stars
and the whole pattern will be ruined!
The Perfect Scientist 