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, ...

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 ...

Optical sensors are a broad class of device for detecting light intensity. This can be just a simple component for notifying when ambient light levels rise above or fall below a prescribed level, or a ...

Heat intolerance happens when your body has trouble regulating its body temperature. Excessive sweating and fatigue are common symptoms of heat intolerance. Drinking plenty of fluids and staying ...