What is peak flow measurement? Peak flow measurement is a quick test to measure air flow out of the lungs. The measurement is also called the peak expiratory flow rate (PEFR) or the peak expiratory ...

From ancient rock art to Egyptian hieroglyphs to Sumerian cuneiform, humans have communicated through iconography for centuries. Today, with global connections on the rise, these symbols have become a ...

Thousands of years ago, our ancestors used symbols to track the sale of textile and agricultural products. New research suggests that these markings informed the development of writing Sarah Kuta ...

Here’s how it works. The world's oldest known system of writing was influenced by symbols used for trade — engravings found on cylinders used in the exchange of farming produce and textiles ...