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72 results for “water”
- The Perpetually Curious! › Canonical › Engineering & TechnologyArticle
🏭 Petroleum Refining: The Process Behind Heat, Pressure, and Design
From section: 🛢️ Crude oil arrives: The beginning of a long transformationBefore any major transformation can occur, the crude is desalted. It is typically heated to about 200 to 300 degrees Fahrenheit (about 100 to 150 degrees Celsius) and mixed with fresh water so that dissolved salts and fine solids can migrate into the water phase and be removed.
- The Perpetually Curious! › Canonical › Planet EarthArticle
🌐 How SONAR Uses Sound to Map the Hidden Ocean Depths
From section: 🕰️ A brief history of SONARThe observation that sound carries well through water was noted as far back as the fifteenth century, but systematic development of SONAR technology did not begin until the early twentieth century. …
- The Perpetually Curious! › CanonicalGateway
⚛️ Physics | ✍️ Articles
From section: 🌊 Buoyancy, Fluids, and the Physics of Bodies in WaterHow density, pressure, and fluid mechanics determine what sinks, floats, and glides through the sea.
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🦠 Listening to the Hidden City Within: Understanding the Gut Microbiome
From section: 🚶♂️ The landscape of the gut: a habitat for microbesChemical gradients further divide this landscape. Oxygen generally becomes scarcer toward the lower intestine and from the tissue surface toward the intestinal contents, while acidity, transit time, bile acids, nutrients, and water availability favor different microbial groups. …
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🌫️ Why We Get Hiccups: The Reflex Beneath Every Small “Hic”
From section: 🐾 Evolutionary echoes: infants, amphibians, and possible originsAnother hypothesis looks further back in evolutionary history. Some researchers have noted that the pattern of muscle contraction and airway closure in hiccups resembles movements used by certain amphibians and lungfish to move water across gills while protecting air-breathing structures.
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🧠 The Brain’s Guarded Border: How the Blood-Brain Barrier Protects Us and Complicates Treatment
From section: 🚦 A border that sorts rather than seals… Water moves through regulated pathways, while glucose, amino acids, ions, vitamins, and other necessities depend heavily on specialized channels and transport proteins.
- The Perpetually Curious! › Canonical › Biology & HealthArticle
🌫️ The Quiet Maps in Our Hands: Why Palm Lines Form and What They Reveal About Development, Movement, and Meaning
From section: ⏳ How palm lines change as we ageOccupational and environmental factors may also influence the surface of the skin. Repeated contact with tools, exposure to water or chemicals, or outdoor work may alter texture, callus formation, or minor markings. …
- The Perpetually Curious! › Canonical › History, Arts, and CultureArticle
🌿 When Color Touches Skin: The Story of Henna on the Fingertips
From section: 🔬 The chemistry behind the red stainFor body art, henna powder may be mixed with water or a mildly acidic liquid. The paste is often allowed to rest for several hours under moderately warm conditions, giving the dye time to become available and disperse through the mixture. …
- The Perpetually Curious! › Canonical › History, Arts, and CultureArticle
🌍 Vertical Worlds: The 14 Lokas in Ancient Indian Cosmology
From section: 🏛️ When cosmic order enters landscapeThe broader story of Mount Kailash as geography, sacred landscape, and cultural meeting place offers a useful parallel. Stone, water, pilgrimage, and cosmological imagination gather around one visible peak, yet each tradition approaches it through its own narratives.
- The Perpetually Curious! › Canonical › Cosmic ExplorationArticle
🌍 When Worlds Pull: Gravity Across the Planets and What It Reveals About Them
From section: Did You Know💧 Saturn has a lower average density than water. Because surface gravity depends on both mass and radius, Saturn’s enormous radius helps offset the effect of its mass, leaving its reference-level gravity only modestly above Earth’s.