› added 5 years ago

453

TIL although regular concrete needs steel formwork, 3D printed concrete has different methods of achieving structural integrity

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via reddit.com

E19Xo TIL Charles Darwin's grandad, Erasmus Darwin, conceived a rocket engine in 1779. It used oxygen and hydrogen for fuel, the same fuels NASA's rockets use today, 200+ years later.
kOw4E TIL that Iran has a disproportionately high rate of penile fracture due to a local practice called taghaandan, "to click or snap when forcibly pushing the erect penis down" to get rid of an unwelcome erection
QyZX TIL In many Nordic cities, parents leave their children unattended in buggies in town, for long periods of time, while they have coffee or go shopping.
ONA6 TIL 44% of the people who didn’t evacuate for Hurricane Katrina stayed because they didn’t want to abandon their pets, this prompted major changes to state and federal laws regarding the evacuation of pets during disasters.
wNvJ TIL A former dictator of of Myanmar thought 9 was his lucky number, so decreed that all currency denominations not divisible by 9 no longer had value, devastating the savings of much of the population.