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Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Anna Attkisson is a full-time Senior Editorial Director for Investopedia, overseeing content strategy and operations. Anna has spent 20 years crafting content around highly complex topics and ...

A person who needs a flu checkup has aches, pain, fever, fatigue, and other symptoms of the flu, an infection caused by a virus that attacks the lungs, nose, and throat. The flu is caused when you ...