The observable universe is only a tiny fraction of the entire universe, which may be infinitely large. elaborate
Water expands when it freezes, unlike most other substances. elaborate
Some proposed geoengineering techniques, like stratospheric aerosol injection, could potentially affect the ozone layer. elaborate
In the context of mathematics, a sequence can converge to a limit that's *not* part of the sequence itself. elaborate
Emissions testing programs were initially spurred by the Clean Air Act of 1970 in the United States. elaborate
Toxicity isn't always immediately apparent; some substances have delayed effects, meaning symptoms might not show up for hours, days, or even years after exposure. elaborate
Microplastics have been found in the deepest parts of the ocean, including the Mariana Trench. elaborate