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.
Around the mid-30s, on average. A Karolinska Institutet study that followed 427 Swedes born in 1958 from age 16 to 63 found that aerobic fitness and muscular endurance peaked between ages 26 and 36, and performance began declining around age 35; explosive muscle power peaked even earlier. The decline starts slowly and speeds up with … Read more
They form when a sinking oceanic plate releases water into the hot mantle above it, lowering its melting point; the resulting magma rises to build steep, often explosive volcanoes in arcs like the Cascades.
A 12-bar blues is a 12-measure chord pattern in 4/4 time built on the I, IV, and V chords, commonly I-I-I-I, IV-IV-I-I, V-V-I-I, with lyrics in an AAB form.
Possibly. A long-term study from Oregon Health & Science University of nearly 200,000 participants in the Nurses’ Health Study, Nurses’ Health Study II, and Health Professionals Follow-up Study found that people who regularly ate after dinner or after bedtime had a 20% to 30% higher risk of liver disease than those who did not eat … Read more
Bacteria are prokaryotic cells with no nucleus: a plasma membrane, cytoplasm, 70S ribosomes, and a nucleoid of circular DNA, usually inside a peptidoglycan cell wall, often with capsules, pili, or flagella.
Solar panels convert sunlight into electricity with semiconductor PV cells, usually silicon. Light frees electrons to create DC current; an inverter turns that into AC for homes and the grid.
A new study links GLP-1 drugs such as semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) to a small increase in the risk of ischemic optic neuropathy, a rare condition in which reduced blood flow to the optic nerve causes sudden, often permanent loss of part of the vision in one eye. Rutgers researchers who analyzed … Read more
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.