A Pompeii site reveals the recipe for Roman concrete. It contradicts a famous architect’s writings

Excavations of an ancient construction site in Pompeii have revealed the process of how Romans mixed their self-healing concrete.
Investopedia

Understanding Level 1, 2, and 3 Financial Assets: Definitions & Examples

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

Understanding Centrally Planned Economies: Features, Pros, and Examples

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Gordon Scott has been an active investor and ...
Lifehacker

What Is Zone 2 Cardio, and How Do I Actually Do It?

A healthy dose of cardio is an important part of your exercise routine, and for a lot of us, "zone 2" cardio is going to make up a big chunk of that. Low-intensity cardio—sometimes called LISS or ...