A tropical cyclone is a rotating low-pressure weather system that has organized thunderstorms but no fronts (a boundary separating two air masses of different densities). Tropical cyclones with ...

Soundings, or water depth measurements, are represented by numbers on nautical charts. Water depths are measured by soundings usually acquired by hydrographic surveys. The depths may be in either feet ...

James Chen, CMT is an expert trader, investment adviser, and global market strategist. Gordon Scott has been an active investor and technical analyst for 20+ years. He is a Chartered Market Technician ...

Marshall Hargrave is a stock analyst and writer with 10+ years of experience covering stocks and markets, as well as analyzing and valuing companies. Robert Kelly is managing director of XTS Energy ...

Jennifer Simonson is a business journalist with a decade of experience covering entrepreneurship and small business. Drawing on her background as a founder of multiple startups, she writes for Forbes ...

You know the "type:" So-called “Type A” personalities are hard-charging, determined to compete and to win. Combining traits such as drive and impatience, Type A was once thought to be related to heart ...

Hepatitis A, also called hep A, is a contagious liver infection caused by the hepatitis A virus. Some people have only a mild illness that lasts a few weeks. Others have more severe problems that can ...

Chlorophyll is a key component of photosynthesis, the process of making food from sunlight, carbon and water. Chlorophyll-a is the predominant type of chlorophyll used by algae and cyanobacteria. It ...

Unlike other types, the hepatitis A virus is rarely dangerous. Almost everyone who gets it makes a full recovery. But since it can take anywhere from a few weeks to several months to clear up, it’s a ...

Learn how to build an a frame house (complete with a cozy sleeping loft) in this illustrated, step-by-step guide. One of the sturdiest of all structures is the A-frame, whose skeleton consists simply ...