refrigerant replacements HFC climate change HFO

Replacing ozone-damaging gases brought a climate cost

CFCs and HCFCs used in air conditioners damaged the ozone layer. HFCs were introduced to replace them, but they worsen climate change. Newer HFO refrigerants have no ozone-depletion potential and much lower global-warming potential.

Children learn most new words without anyone formally teaching them

Children acquire vocabulary far faster than adults could teach every word individually. They use context, familiar sentence patterns, gestures and repeated encounters to infer what unfamiliar words mean. Direct instruction helps, but much language learning happens during ordinary conversation and observation. Children are constantly solving small puzzles about meaning.

Centaurs may become comets or leave the Solar System

Centaurs are icy objects that were probably pushed inward from the outer Solar System by the giant planets. Over time, they are expected either to become comets or to be thrown out of the Solar System.

Like this? There’s a whole feed of it. Replace empty scrolling with things worth knowing.

Download Hence for free

refrigerant replacements HFC climate change HFO

Replacing ozone-damaging gases brought a climate cost

Keep exploring