Fahrenheit is a temperature scale where freezing point of water is 32 o F and the boiling point of water is 212 o F. The difference is 180 degrees.The absolute zero is -459.67 Fahrenheit.t is also known as centigrade. It is defined where freezing point of water is 0 and the boiling point is 100 degrees. The abbreviation is  o C. The fahrenheit to celsius conversion formula: Celsius = (Fahrenheit - 32) * 5 / 9.
Environmental Toxicology. Environmental toxicology is a good area of study for science majors who are interested in pollutants and their effect on the physical environment. Read on to discover academic and career options in this interdisciplinary science that examines how toxins affect human health and other life forms.
Medical entomology. The discipline of medical entomology, or public health entomology, and also veterinary entomology is focused upon insects and arthropods that impact human health. Veterinary entomology is included in this category, because many animal diseases can jump species and become a human health threat, for example, bovine encephalitis.