Inequality has been linked to human sustainability for over 10,000 years, according to new findings by archaeologists.

Researchers at Washington State University have developed a new  forecasting model that helps companies more accurately estimate how many customers are interested in a product—even when key data is missing. Published in the journal Production and Operations Management, the study introduces a mathematical modeling method that enables businesses to estimate customer interest beyond just completed transactions and traditional forecasting techniques. The approach offers a more precise way to understand demand, optimize operations and improve decision-making.

A new study suggests that perceived stress and depression factor into the relationship between insomnia and hazardous drinking – perhaps not a surprise. But because the relationship between insomnia and heavy drinking goes in both directions, the influence of stress or depression depends on which condition came first, the analysis found.