The stress response exists for the purpose of survival. When we experience stress, our sympathetic nervous system activates, blood pressure and heart rate increase, and often we begin to sweat. These physiological reactions prepare us for "fight or flight." Our bodies are at optimal physical performance and alertness levels, and we are therefore optimized for survival in a physically challenging situation. Sometimes we use this physiological activation to our advantage: Consider a champion weightlifter who, prior to lifting an extremely heavy weight, "pumps himself up." By doing this, the weightlifter is attempting behaviorally to elicit a stress response from his brain and body in order to achieve the highest level of physical performance ...

A wholphin is a rare fertile hybrid born from mating a bottlenose dolphin (Tursiops truncatus) (mother), and a false killer whale (Pseudorca crassidens). Although they have been reported to exist in the wild, the first captive wholphin was born in 1945, where a bottlenose dolphin and a male false killer whale shared a pool.

The wholphin's size, color and shape are intermediate between the parent species. For example, an adult wholphin has 66 teeth - intermediate between a bottlenose (88 teeth) and false killer whale (44 teeth). They are smaller than a false killer whale but are larger than a normal bottlenose.

Normally, when two different, yet similar species mate, such as a female horse and a male donkey forming a mule, the progeny is expec ...

What's the difference between a child with attention-deficit hyperactivity disorder (ADHD) and one who is simply more active than other children?

Many children are rambunctious, to an extent that their parents or teachers find somewhat worrisome. Figuring out how to distinguish between normal high-energy levels and pathological overactivity can be quite difficult. Furthermore, the distinction can be complicated by parental tendencies to be permissive and to fail to set up clear rules, reprimands, or restrictions for when a child steps outside the limits.

Figuring out how to make this distinction is not a trivial issue. Children diagnosed with ADHD are usually prescribed methylphenidate (Ritalin) or other medications that lessen their activity ...

The United States has two kinds of physicians, the Doctor of Medicine (MD) and the Doctor of Osteopathy (DO). Both use medicines, surgery, and other standard methods of treating disease. DOs, however, place special emphasis on problems involving the musculoskeletal system, which includes muscles, ligaments, bones, and joints. Nevertheless, both doctors receive virtually identical training, and are equally licensed in all 50 states.

Osteopathic medicine holds that true health involves complete physical, mental, and social well-being, rather than merely the absence of disease. In this system, the body has a capacity for health that the physician helps the individual attain. The osteopathic physician, therefore, treats the whole patient, consid ...

An archaeologists is a scientist who studies human history by discovering and examining human remains and artifacts. The most common image of an archaeologists is someone on their hand and knees digging through dirt, carefully using a brush to dust off an artifact from the distant past. A geneticist, on the other hand, is someone who specializes in the science of genetics. This field of biology deals with the pattern of inheritance, molecular structure and function of genes, and gene behavior in context of a cell or organism. Both professionals are highly skilled, and use the same basic principles of science to test hypotheses, gather data, and make conclusions. However, why do archaeologists and geneticists sometimes reach different conclu ...

Bisphenol A (BPA) is a synthetic compound that serves as an important component in plastics. Plastics made with BPA are usually clear and tough, and can be used in a variety of common consumer goods, such as plastic water bottles, food storage containers, and certain baby bottles. Due to its versatility, an estimated 4 million tonnes of BPA-derived chemical were produced in 2015, making it one of the highest volume of chemicals produced worldwide. 

For some time, BPA has been a popular topic in the media due to its undesirable effect on human health and the environment. In fact, back before BPA was every used in manufacturing, its first purported benefit was as an artificial estrogen. Due to its chemical structure, BPA is classified as a " ...

Different animals have different collective names, which are what groups of the animals are called.

Let's see how many of these you already know; check your answer my clicking the button underneath each photo.





















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