THE CRA PERSPECTIVE Ancient Engineering Wonders That Still Challenge Our Imagination From underground cities and precision-cut stone to monumental temples and sophisticated water systems, the ancient world was far more technologically capable than we sometimes imagine. Some of humanity's greatest engineering achievements were built long before modern machines, computers and industrial technology. Across continents, ancient civilizations transformed stone, mountains, water and landscapes into extraordinary structures. Their achievements reveal not only physical strength, but also planning, mathematics, craftsmanship, environmental awareness and generations of accumulated knowledge. These monuments invite us to ask an intriguing question: How did ancient societies accomplish eng...
Kefir: A Tangy Probiotic Beverage A glass of kefir being poured. Kefir is a cultured, fermented milk drink originally from the Caucasus Mountains of Eurasia. It has a tangy, slightly sour taste and a gentle fizziness from fermentation. In texture it’s like a thin, drinkable yogurt – usually made from cow, goat, or sheep’s milk. People add “kefir grains” (gelatinous clusters of bacteria and yeast) to milk and let it sit at room temperature; the microbes in the grains turn the milk sugar (lactose) into lactic acid, tiny bubbles of carbon dioxide, and a trace of alcohol. The result is a nutritious dairy beverage rich in protein, calcium and B vitamins, loaded with live probiotic organisms (beneficial bacteria and yeasts) that help maintain healthy gut flora. Today kefir is enjoyed worldwide – plain or flavored – and comes in many varieties (even non-dairy versions made with water or juice). Origins and Traditional Use Kefir has a long history as a health-promoting folk food. It l...