Learn how to build a simple solar cell at home using copper tape, plastic cups, and water. This step-by-step science experiment demonstrates how to harness solar energy to generate electricity.

Melissa Horton is a financial literacy professional. She has 10+ years of experience in the financial services and planning industry. Robert Kelly is managing director of XTS Energy LLC, and has more ...

Kristina Byas is contributor at Investopedia. As a personal finance expert, she has lent her insights and knowledge to numerous financial publications. Her articles have helped readers navigate the ...