Did you know? On October 4, 1582, the Julian calendar was 11 days behind Earth's orbit around the Sun. Thus, the Gregorian calendar (our current one) was introduced, changing how often leap years occur and making the next day October 15. #fact #history #time

Did you know? Geniuses ask more questions than people with low intelligence, due to high curiosity and constant learning (e.g., digging into basic ideas). #fact #psychology #intelligence #science

Did you know? The Russian proverb "trust, but verify" (доверяй, но проверяй "doveryay, no proveryay") was popularized in English in the 1980s by then-US president Ronald Reagan. #fact #history #wisdom

Did you know? If a feather and hammer are released together at the same height, they'll land simultaneously (assuming no air resistance). This experiment was done on the moon in 1971, during the Apollo 15 mission: www.youtube.com/watch?v=Oo8T... #fact #science #physics #history

David Scott does the feather hammer experiment on the moon | Science News

YouTube video by Science News

youtube.com

Did you know? "Police police police police police police police police" is a grammatically correct sentence. It means "The police police, which the police police police watch over, police the police." This allows adding a multiple of three "police"s. #fact #language #grammar #english

I made a @desmos.com graph that shows the tangent plane to a 3D surface, like tangent lines in 2D: www.desmos.com/3d/503bdee7f6 #math #3d #calculus #interactive #intuitive #education

Tangent Planes

desmos.com

Did you know? The word "logarithm" was invented by John Napier (1550-1617) from Modern Latin "logarithmus" (ratio-number), from Ancient Greek λόγος (lógos) "ratio, proportion, word" + ἀριθμός (arithmós) "number". The last term is also where we get "arithmetic"! #fact #math #words #history

Did you know? Light travels ~29.98 cm in a nanosecond (one-billionth of a second), which is about 12 inches or one foot. This is called a light-nanosecond, similar to a light-year, and it limits how fast information can be sent. #fact #science #physics #measurement

Did you know? The first letters of the 7th-11th months of the year (July, August, September, October, and November) spell "JASON". #fact #words #names

Did you know? Anger is a secondary emotion, meaning a primary emotion (e.g., sadness, fear, disgust) comes before it. Also, we can't get angry over something we don't care about, making it impossible to feel anger without love. #fact #psychology #feelings

Did you know? Leonardo of Pisa, better known as Fibonacci, is famous for the sequence of the same name (1, 1, 2, 3, 5, 8, 13…). He also spread Hindu-Arabic numerals (0-9) through Europe, replacing Roman numerals (which use the letters IVXLCDM) and making calculations easier. #fact #math #history

Did you know? CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. Plus, one of its creators, Luis von Ahn, invented reCAPTCHA (acquired by Google in 2009) and co-founded Duolingo. #fact #technology #computers #security

Did you know? If light enters a material where its speed changes (refraction), the fastest path between two points is the one it already takes. All other paths are slower, and this is called Fermat's principle of least time. #fact #physics #science #optics

Did you know? Roosevelt (meaning "rose field") is pronounced ROH-zuh-velt because it comes from Dutch, where a double O is sounded like the long O in "hope." For the "oo" sound in "boot," Dutch uses "oe" (like in "pannenkoek," which means "pancake"). #fact #names #language #pronunciation

Did you know? Saturn is the only planet less dense than water (687 kg/m³ compared to 1,000). That means if the planet were in a large enough body of water, it would float! 🪐 #fact #astronomy #physics #science

Did you know? Jupiter doesn't orbit the Sun. Because the planet is so large, it orbits a point just outside the Sun's surface, called a barycenter (center of mass). #fact #physics #astronomy #science

Did you know? The loudest possible sound is 194 dB (decibels), at sea level and normal atmospheric pressure. Beyond that, sound waves become shock waves, like from an explosion. 💥 #fact #science #physics

Did you know? The ancient Roman calendar had ten months, making September–December the 7th–10th ones (after the Latin words for each number). In 710 BC, January and February were added, throwing off the numbering system. #fact #history #naming

Happy first day of August! It's been years since my graduation, but I'm still getting #backtoschool vibes. 🏫

Did you know? "&" was the 27th letter of the English alphabet, recited as "X, Y, Z, and per se and." "Per se" is Latin for "by itself," referring to the letter and not the word "and." Eventually, "and per se and" was pronounced "ampersand," the symbol's official name. #fact #history #origin #words

Did you know? "Gravity" comes from Latin "gravitas" (weight/seriousness). It's also related to the adjective "grave" and the noun "grief," both from Latin "gravis" (heavy/serious). #fact #words #origin #vocabulary

Did you know? France has a commune called Y, the country's shortest place name: en.wikipedia.org/wiki/Y,_Somme #fact #names #locations

Y, Somme - Wikipedia

en.wikipedia.org

Did you know? Download speed is faster than upload speed for cable Internet because users spend more time downloading files than uploading, which ISPs (Internet Service Providers) regulate. For fiber Internet, the speeds match. #fact #technology #wifi

Did you know? The abbreviations "e.g." and "i.e." come from Latin, standing for "exempli gratia" (for example) and "id est" (that is). How to remember: - e.g. → example given - i.e. → in essence (or "in other words") #fact #language #origin #words

Did you know? Uranus is the only planet named after a Greek deity (Ouranos, the god of the sky). His Roman equivalent is Caelus (KIGH-luhs). #fact #astronomy #naming #mythology

Did you know? Poland and Ukraine used to be one country and still have close contact. As such, Polish and Ukrainian have similar vocabulary (sharing 70% of words) and grammar, despite using different alphabets (Latin vs. Cyrillic). #fact #history #language

Did you know? Mirrors are reflective due to their smooth surfaces (specular reflection). Many other objects that look smooth are bumpy on the microscopic scale, so light bounces off in random directions (diffuse reflection). Thus, no clear image forms. #fact #physics #science #optics

Did you know? CPU clock speed (cycles/second, often in gigahertz (GHz)) and instructions per second (IPS) are not the same. This is because modern processors can run many instructions in one cycle, reaching 100 billion to a trillion operations per second. #fact #computers #technology

Happy Pi Approximation Day (22/7 = 3.14285714... ≈ 3.14159265... = π)! Enjoy eating pie/pizza, memorizing pi's digits, or doing whatever you do on Pi Day (March 14)! 🥧🍕 #math #holiday #celebration

Did you know? The fastest artificial satellite is NASA's Parker Solar Probe, at 430,000 mph (692,000 km/h) close to the Sun. This is about 119 miles (192 km) per second, or ~0.064% the speed of light. 🛰️☀️ #fact #science #astronomy