What is the difference between strong and weak bases?
A strong base such as sodium hydroxide ionizes completely in water, while a weak base such as ammonia only partly reacts with water to form hydroxide ions.
How is coffee decaffeinated?
Green coffee beans are moistened and stripped of caffeine with a solvent, filtered hot water (Swiss Water process), or high-pressure CO2 before roasting; these methods remove roughly 94% to 98% of the caffeine.
What are stratovolcanoes?
Stratovolcanoes, or composite volcanoes, are steep, conical volcanoes built from layers of viscous lava, ash, and pyroclastic flows, and they are known for explosive eruptions.
How close was Nazi Germany to a working nuclear reactor?
Not very close, according to a new analysis. Germany’s last reactor experiment, the B8 pile that Werner Heisenberg’s team assembled at Haigerloch in 1945 using cubes of natural uranium suspended in heavy water, never reached criticality (a self-sustaining chain reaction). Heisenberg later said it needed only a modest amount of extra uranium, but researchers led … Read more
What is the 24-hour cancellation rule for flights?
U.S. rules require airlines to either hold a reservation at the quoted fare for 24 hours without payment or let you cancel within 24 hours for a full refund, if you book at least seven days before departure.
How low did Arctic sea ice get in 2026?
Arctic sea ice reached its 2026 annual minimum on September 12, covering about 4.6 million square kilometers (1.78 million square miles). According to NASA and the National Snow and Ice Data Center, that tied 2008, 2010, and 2025 for the 10th-lowest minimum since satellite records began in late 1978. The smallest extent on record is … Read more
What are celestial bodies?
Celestial bodies are natural objects in space such as stars, planets, dwarf planets, moons, asteroids, and comets; astronomers often use the term interchangeably with astronomical object.
What is a birdie in golf?
A birdie is one stroke under par on a golf hole, such as a 3 on a par-4. An eagle is two under par, an albatross three under, and a bogey one over.
What is the largest crayfish in North America?
The largest known North American crayfish is a Tennessee bottlebrush crayfish held in the Astacology Collection at West Liberty University in West Virginia. Collected in 2011 by Zac Loughman and West Liberty students, it measures 86.6 millimeters (about 3.4 inches) in body length, not counting its tail, claws, or antennae. The record comes from a … Read more
What are the six essential nutrients?
The six essential nutrients are carbohydrates, proteins, fats, vitamins, minerals, and water; the first three supply calories, while vitamins, minerals, and water regulate body processes and support growth and repair.