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A. In general, anyone who wants to reduce their chances of getting the flu can get vaccinated. However, it is recommended that certain people should get vaccinated each year. They are either people who are at high risk of having serious flu complications or people who live with or care for those at high risk for serious complications. People who should get vaccinated each year are:
1. Children aged 6 months up to their 19th birthday
2. Pregnant women
3. People 50 years of age and older
4. People of any age with certain chronic medical conditions
5. People who live in nursing homes and other long-term care facilities
6. People who live with or care for those at high risk for complications from flu, including: Health care workers, Household contacts of persons at high risk for complications from the flu and Household contacts and out of home caregivers of children less than 6 months of age (these children are too young to be vaccinated)

A. Insulin is a hormone (substance that controls the activity of the body) that enables muscles and fat to use the glucose (sugar) we get from the diet as a source of energy for activity or for storage as fat. Thus, it lowers the concentration of glucose in the blood. It's produced and secreted from the pancreas, a gland located in the back of the abdomen. When people don't have insulin, or if the body doesn't respond to insulin (essentially diabetes mellitus type 1 and 2, respectively), therapy with insulin helps the body maintain a normal level of glucose. Excessive concentration of glucose in the blood is termed "hyperglycemia" and is deleterious in the long term.

You may read more here: http://en.wikipedia.org/wiki/Insulin

A. No. Currently there are no available medications for birth control for men. However, there are several other methods, including barrier methods (condom) and more irreversible ones (e.g. vasectomy) which may require a treatment by a surgeon.

You may read more here: http://www.nlm.nih.gov/medlineplus/ency/article/001946.htm