Kurzgesagt – In a Nutshell

122 Cards across 12 Sources·Added to Korva by @mirabaines, @sophievenn, @leahormond and others

What Happens if the Moon Crashes into Earth?12 Cards

At geosynchronous altitude, the Moon would appear fixed above one location, completing its full phase cycle every 24 hours.

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Crossing roughly 10,000 kilometers from Earth would carry the Moon past the Roche limit and tear it into rubble.

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The Largest Star in the Universe – Size Comparison12 Cards

Light takes 8.7 hours to circle Stephenson 2-18 once. An Earth aircraft would need roughly 500 years.

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Rho Cassiopeiae packs 40 Suns of mass into a star 500 Suns wide.

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Loneliness12 Cards

Loneliness heightens attention to social signals while warping interpretation, making neutral faces look hostile.

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Loneliness can become a loop: isolation worsens sadness, negative interpretations, avoidance, and deeper isolation.

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The World War of the Ants – The Army Ant11 Cards

Some ants evolved workers with oversized square heads that plug nest entrances and force army ants to abandon attacks.

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Some ant supercolonies span thousands of square kilometers across multiple continents, fighting wars kilometers apart.

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The Internet is Worse Than Ever – Now What?11 Cards

Online, people encounter more ideological diversity than offline, where their real-world networks are more politically homogeneous.

@leahormond added

The evidence poorly supports the idea that online filter bubbles isolate people ideologically. Extreme filter bubbles are rare.

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Black Holes Explained – From Birth to Death11 Cards

Replace the Sun with an equally massive black hole and Earth’s orbit would largely stay the same, but Earth would freeze.

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A smaller black hole can destroy you before its horizon, while a supermassive one may let you travel far inside.

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How The Immune System ACTUALLY Works – IMMUNE10 Cards

An activated B cell can produce up to 2,000 antibodies every second.

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Some neutrophils trigger suicide, explode, and cast DNA-based toxic nets that trap and kill bacteria.

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What Happens If We Throw an Elephant From a Skyscraper? Life & Size 110 Cards

An ant can be thrown from an airplane without serious harm. At its scale, falling is largely irrelevant.

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A wet mouse carries three grams of water, over 10% of its weight. Wet humans carry 800 grams, about 1%.

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The Gulf Stream Explained10 Cards

The Gulf Stream carries heat equivalent to one million nuclear power plants, keeping Europe five to ten degrees warmer.

@juneselby added

Deep-water “Chimneys” drop water 4,000 meters through 15-kilometer-wide pillars at 17 million cubic meters per second, roughly 15 rivers’ worth.

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When This Number Hits 5200 - You Will be Dead9 Cards

Dying at 80 leaves roughly 780 post-retirement weeks, about as many free weeks as childhood.

@sophievenn added

After moving out, seeing your parents for two weeks a year means more than 90% of your time together has passed.

@sophievenn added

The World’s Most Average Person8 Cards

The world’s average person is Indian, speaks Mandarin Chinese, and is 31 years old.

@leahormond added

Grains provide about 40% of the average person’s calories, while sugar adds nearly 26 cubes daily.

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Processed Food Won’t Kill You6 Cards

Fresh spinach can lose up to half its vitamin C before reaching consumers, while freezing preserves nutrients longer.

@evanhollis added

A diet providing 90% of its calories from ultra-processed food can still meet healthy eating guidelines.

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