The different ways that the environment gets contaminated.
Niacin is an essential vitamin that helps the digestive system, skin and nervous system to function.
Lungs are an important part of the respiratory system. Adults take 15 to 20 breaths a minute, which comes to around 20,000 breaths a day.
Russian culture has a long and rich history, steeped in literature, ballet, painting and classical music. Here is a brief overview of Russian customs & traditions.
Alpacas are domesticated versions of a South American ruminant called the vicuña. There are no alpacas in the wild.
Gluten refers to the proteins found in wheat endosperm. Some people are gluten-intolerant, but a gluten-free diet is not for everyone.
Humans have five basic senses: touch, sight, hearing, smell and taste. Other senses also help us understand and perceive the world around us.
Synesthesia is a neurological condition that causes the brain to process data in the form of several senses at once; for example, hearing sounds while also seeing them as colorful swirls.
Polymers are materials made of long, repeating chains of molecules. There are natural and synthetic polymers, including proteins and rubber, and glass and epoxies.
Chronic traumatic encephalopathy (CTE) is a degenerative brain disease that kills brain cells. However, little is known about this condition.
Jaguars are large cats that can be found in North, Central and South America. They are identified by their yellow or orange coats, dark spots and short legs.
Foxes are found all over the world. In folklore, foxes are typically characterized as cunning creatures sometimes having magical powers.
Tonsil stones are accumulations of bacteria and debris in the crypts of some people's tonsils. This problem is not dangerous and is usually easily treatable.
The American bison is the official mammal of the United States and is the largest mammal in North America.
The consequences of global warming are expected to be far-reaching, long-lasting and, in many cases, devastating.