Simple table for converting drops to mL. Many natural remedies formula specify the number of drops of liquid to use. As pharmacists, we tend to want to use a more accurate measure such as milliliter (mL). This also goes for using antiquated terms like teaspoon (5 mL) or tablespoon (15 mL).
1 On school days, after school hours, no minor under the age of 16 is permitted to work in excess of 6 hours unless the next day is not a school day.  Except for babysitters, no minor under the age of 16 is permitted employment between the hours of 9:30 p.m. and 5:00 a.m. unless the next day is not a school day.
There are certain laws called child labor laws that have a minimum age at which a person can begin to work. In Iowa (based on the Labor Laws Page) it says that anyone under 16 must have a workers permit to get a job. I believe the only exception for a 13 year old is if they work for THEIR family business. If you want more in depth information Click on the source link.