This illustration shows how light enters a reflector telescope. Optical telescopes allow us to see further; they are able to collect and focus more light from distant objects than our eyes can alone. This is achieved by refracting or reflecting the light using lenses or mirrors.
Labor burden is the actual cost of a company to have an employee, aside from the salary the employee earns. Labor burden costs include benefits that a company must, or chooses to, pay for employees included on their payroll.
Child Labor Over 100 million children around the world work in hazardous conditions in agriculture, mining, domestic labor, and other sectors. On tobacco farms, children work long hours in extreme heat, exposed to nicotine and toxic pesticides that can make them sick.