Rocket (firework) century. Yet with all these drawbacks fireworks will continue to maintain their use as a traditional pastime with an ongoing history of nearly 5,000 years. Rocket (firework) A rocket is a pyrotechnic firework made out of a paper tube packed with gunpowder that is propelled into the air. Types of rockets include the skyrockets, which have a stick to provide stability during airborne flight; missiles, which instead rotate for stability or are shot out of a tube; and bottle rockets, smaller fireworks – 1½ in (3.8 cm) long, though the attached stick extends the total length to approximately 12 in
Fair cake-cutting or more agents assign a positive value, so all parts of the cake are divisible. Additionally, in some cases, the value functions are assumed to be sigma additive (the value of a whole is equal to the sum of the values of its parts). In the following lines we will use the following cake as an illustration. The original and most common criterion for justice is "proportionality" (PR). In a proportional cake-cutting, each person receives a piece that he values as at least 1/"n" of the value of the entire cake. In the example cake, a proportional division can be