Under U.S. DOT rules, airlines must refund canceled or significantly changed flights within 7 business days for credit card purchases and 20 calendar days for cash, check, debit, or other payments.
It depends on the plastic, but in a new University of Konstanz study several biodegradable plastics broke down completely in forest soil in roughly 250 to 330 days, or about nine to eleven months. The materials tested were long-chain aliphatic polyesters (LCAP) along with the bioplastics PHBV and PCL. For comparison, plain cellulose broke down … Read more
Superplasticizers are high-range water-reducing concrete admixtures (ASTM C494 Type F or G) that cut mix water by at least 12%, and often over 30%, for stronger or more flowable concrete.
Blue notes are slightly lowered (flatted or bent) pitches, mainly the third and seventh of the scale and often the fifth, that give the blues its distinctive sound.
They are ripples in the air, not in the ocean or in spacetime. In a strong hurricane, heat released near the eyewall drives powerful updrafts that build towering thunderstorm clouds, and those updrafts jolt the surrounding atmosphere. The disturbance travels upward and outward as waves, with gravity acting as the restoring force that pulls displaced … Read more
Sunnah prayers are voluntary prayers Muslims add to the five obligatory daily prayers; the confirmed set is 12 rak’ahs around Fajr, Dhuhr, Maghrib, and Isha.
A limited-purpose FSA is an employer health FSA that only covers items like dental and vision care, so you can use it and still contribute to an HSA.
A sultanate is a state or territory ruled by a sultan, a title Muslim sovereigns have used since the 11th century; Brunei and Oman are sultanates today.
It has mostly been shrinking since 2016. Between 1979 and 2014, Antarctic sea ice extent grew by about 1% per decade, with record winter highs in 2012 through 2014, but the trend reversed after 2015 and the ice has generally stayed below its historical average since then. In 2023 Antarctica recorded both its lowest summer … Read more
The northern lights happen when energetic electrons guided by Earth’s magnetic field hit oxygen and nitrogen 80 to 500 km up, exciting them so they give off light.