Scientists have uncovered a previously unknown cluster of brain cells that may help explain differences in social behavior ...

Researchers at the Icahn School of Medicine at Mount Sinai, in collaboration with other leading institutions across the ...

You can get pregnant from your first menstrual period until menopause, but fertility declines with age and drops faster after about ages 35 to 37 years. Experts say the best time to get pregnant is ...

Immunodeficiency disorders weaken your immune system, making it harder to fight bacteria, viruses, and parasites and increasing your risk of frequent infections. There are two main types: primary ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Lea Uradu, J.D., is a Maryland state registered tax preparer, state-certified notary public, ...