The factors used to determine tumor grade can vary between different types of cancer. Tumor grade is not the same as the stage of a cancer. Cancer stage refers to the size and/or extent (reach) of the original (primary) tumor and whether or not cancer cells have spread in the body. Cancer stage is based on factors such as the location of the primary tumor, tumor size, regional lymph node involvement (the spread of cancer to nearby lymph nodes), and the number of tumors present.
According to an international team of scientists reporting in the Proceedings of the National Academy of Sciences, an asteroid or comet that landed in what is now the Canadian province of Quebec might have led to a significant climate change event known as Younger Dryas.
Some people are more likely to have dry skin. Some causes of dry skin are: Age: As we age, our skin becomes thinner and drier. By our 40s, many people need to use a good moisturizer every day. Climate: Living in a dry climate such as a desert. Skin disease: People who had atopic dermatitis (also called eczema) as a child tend to have dry skin as adults. Psoriasis also causes very dry skin. Job: Nurses, hair stylists, and people in other occupations often immerse their skin in water throughout the day. This can cause the skin to become dry, raw, and cracked.