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In 1862, Alexander Parks was the first person to manufacture plastic in London, England. The Chemical formula for plastic is CH2=CHCl (Polyvinyl C hloride). Some of the properties of plastic are: flexibility, water resistance, and transparency. The properties of plastic, such as water resistance, help a high-heeled shoe. If the plastic in the heels are water resistant, they will not get damaged when you're walking through rain and puddles. Plastic is now a material that we use in every day life. For instance, when you go to Tamimi Markets, and buy a Bottle of milk, and you then put it into a plastic cart or a basket, and then carry it out of the shop in a plastic bag, it's just a unconscious action. You don't really think about having to carry a glass bottle of milk a ll the way home and having to worry about it breaking. For this reason, plastic is used in many objects used in everyday life. The downside to using plastic, is that much of it end up in the oceans, and they can hurt ani mals. For instance, a bird sometimes mistakes a plastic bag for food, and if it's ingeste d, it can easily kill or seriously injure the bird.

Reasons against wearing high heels, which are almost exclusively health and practicality reasons, include:
 * They can cause foot pain.
 * They increase likelihood of sprains and fractures.
 * They make calves look more rigid.
 * They can create foot deformities.
 * They can cause you to lose balance
 * They can shorten the wearer's stride.
 * They can render the wearer unable to run.
 * Altered forces at the knee caused by walking in high heels may change the knee joint.
 * Women who wear high heels frequently have a higher incidence of degenerative joint disease of the knees. This is because they cause a decrease in the normal rotation of the foot, which puts more rotation stress on the knee.

blue- ifrah Purple-Sofia

http://inventors.about.com/od/pstartinventions/a/plastics.htm http://www.blurtit.com/q146321.html http://wiki.answers.com/Q/What_are_the_chemical_and_physical_properties_of_plastic http://www.iwma.com/programs-events/Impact%20of%20Plastic.html

Purple-Sofia