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The phrase 'OK' is the most widely understood expression in the world — its origin is debated.
English has the most borrowed words of any language — absorbing vocabulary from over 350 languages.
The word 'serendipity' was coined in 1754 by Horace Walpole — from an old name for Sri Lanka.
The world's fastest text message — 17 words in 18.44 seconds — was typed on a touchscreen by Marcel Fernandes.
The Oxford comma can prevent genuine ambiguity — 'I dedicate this to my parents, Ayn Rand and God.'
The word 'salary' derives from 'sal' (salt) — Roman soldiers were paid a salt allowance.
English has more irregular verbs than any other Germanic language — a result of Old Norse and Norman French influence.
The word 'mortgage' comes from French for 'death pledge' — the debt dies when paid off.
Cursive writing was developed to reduce the number of times a quill had to be lifted from parchment.
The ampersand (&) was once the 27th letter of the English alphabet.
The word 'emoji' is Japanese for 'picture character' — e (picture) + moji (character).
The shortest grammatically complete sentence in English is 'Go.' — subject implied.
The word 'set' has 430 definitions in the Oxford English Dictionary — the most of any English word.
The 'main sequence' on the H-R diagram is where most stars spend 90% of their lives — fusing hydrogen.
Stars process hydrogen into helium through two mechanisms — the proton-proton chain and the CNO cycle.
The Milky Way contains an estimated 100–400 billion stars.
White dwarfs cool over trillions of years — eventually becoming cold, dark 'black dwarfs.'
The oldest known star is Methuselah (HD 140283) — estimated to be 13.8 billion years old, nearly as old as the universe.
The nearest star to Earth (other than the Sun) is Proxima Centauri — 4.24 light-years away.
Stellar winds from massive stars sculpt nebulae — creating pillars, bubbles, and cavities in the gas.
The helium flash marks the moment a red giant star begins fusing helium — it occurs explosively over minutes.
Stars in the galactic bulge are generally older than those in the spiral arms.
Red dwarfs are the most common stars — they're dim, long-lived, and make up 75% of all stars in the Milky Way.
Betelgeuse, the red supergiant shoulder star of Orion, is expected to explode as a supernova within 100,000 years.
The Orion Nebula, visible to the naked eye, is a stellar nursery — thousands of stars are forming within it.
Hypernovae — more powerful than supernovae — are thought to produce long-duration gamma-ray bursts.
Brown dwarfs form like stars but lack the mass to sustain nuclear fusion — they're between giant planets and stars.
T Tauri stars are young protostars that have not yet begun hydrogen fusion — they're active and variable.
A magnetar's magnetic field is so intense that at a distance of 1,000 km, it would erase all data on hard drives.
The Chandrasekhar limit (1.4 solar masses) is the maximum mass of a stable white dwarf — above it, a Type Ia supernova occurs.
Wolf-Rayet stars are massive, extremely hot, and losing mass rapidly through powerful stellar winds.
Variable stars change brightness periodically — Cepheid variables are used as distance markers across the cosmos.
Population II stars are ancient and metal-poor — they formed shortly after the Big Bang.
Population I stars like the Sun are metal-rich — they formed from gas enriched by earlier generations of stars.
The Hertzsprung-Russell diagram plots stars by luminosity and temperature — revealing patterns of stellar evolution.
Pulsars emit radiation beams from their magnetic poles — if those beams sweep Earth, they appear to pulse.
Binary star systems — two stars orbiting each other — are more common than single stars like the Sun.
The elements heavier than iron can only be forged in supernovae — they're distributed into space by the explosion.
Type II supernovae occur when massive stars exhaust their fuel and their cores collapse — the outer layers explode.
Neutron stars are so dense that a cubic centimeter of neutron star material weighs a billion tons.
Our Sun is a yellow dwarf star — it will become a red giant in about 5 billion years.
The life span of a star is inversely related to its mass — more massive stars burn faster and die younger.
Stars are born in nebulae — vast clouds of gas and dust that collapse under gravity.
Emotional contagion — 'catching' others' moods — occurs unconsciously through facial mimicry and autonomic matching.
First impressions form within 7 seconds — and are dominated by trustworthiness, then dominance, then attractiveness.
Gratitude expression in relationships — specifically noting what your partner does — predicts relationship longevity.
Social exclusion activates the same brain regions as physical pain — rejection hurts, literally.
The 'hedonic treadmill' — adapting to both good and bad events — means major life changes have less lasting impact on happiness than expected.
Research shows that people overestimate how much strangers will think badly of them — the spotlight effect.
The 'mere exposure effect' causes people to prefer things simply through repeated exposure — including other people.