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 ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Doretha Clemons, Ph.D., MBA, PMP, has been a corporate IT executive and professor for 34 ...

Recovering plastic packaging from mixed domestic waste, as well as collecting plastic waste already sorted by households, increases recycling volumes but raises contamination and safety risks.

About Principal Financial Group Inc. Principal Financial Group, Inc. engages in the investment management offering business. It offers financial products and services to businesses, individuals, and ...