Barbarian, currently used for Uncivilized or primitive 👺, was actually used by Ancient Greek to refer to people who did not speak Ancient Greek, because to them all other languages sounded like Bar Bar Bar Bar Bar, gibberish.— Arpit Bhayani (@arpit_bhayani) May 18, 2019
Now that is some stereotyping.#TIL #History
The trigonometric function, sine, has a really interesting etymology.— Arpit Bhayani (@arpit_bhayani) May 17, 2019
It started from India, through Sanskrit word for Chord, Jya, then transliterated tin Arabic as Jiba, Jb and Jaib, which means Breast, then translated into Latin as Sinus, and then to sine.#TIL #Etymology
You see objects 🚗 when the light 🔦 reflected from it reaches your eye. But you understand this light (encoded in electric signals) when it reaches your brain 🧠— Arpit Bhayani (@arpit_bhayani) May 16, 2019
This process of understanding light signals takes about 0.15-0.2 seconds ⏲️#TIL #Misc
How Ozone absorbs UV rays? ☀️— Arpit Bhayani (@arpit_bhayani) May 15, 2019
UV rays hits Oxygen and splits it into 2 Oxygen atoms. Oxygen atom then combines with Oxygen molecule to form Ozone. When UV hits this Ozone it splits it into 1 atom and 1 Oxygen molecule. This continuous cycle thus absorbs ☠️ UV#TIL #Science
Why is Area of triangle 📐 is (b*h)/2?— Arpit Bhayani (@arpit_bhayani) May 14, 2019
Take 2 right angled triangles and form a rectangle with it. Area of this rectangle is (b*h). The area of triangle is half of it, equaling (b*h)/2.
For other triangles, slice them into right angled ones and add.#TIL #Mathematics
#TIL #History— Arpit Bhayani (@arpit_bhayani) May 11, 2019
The life of Foragers, 15000 years ago, was not nasty as we think, rather they spent less time working, and more on Art 🖼️ Music 🎶 and Storytelling 🧓
This was found by studying fossil remains; their bones and teeth were healthier than agriculturists 🍎
#TIL #Misc— Arpit Bhayani (@arpit_bhayani) May 9, 2019
There exists Half QWERTY keyboards designed for mobile phones 📱 where 2 characters (ex: Q and W) share the same key.
Nokia 🤝 was one of the most popular brand to have adopted this keyboard layout, for its E55 model.
#TIL #Science— Arpit Bhayani (@arpit_bhayani) May 8, 2019
The Doppler Effect is the change in frequency/wavelength 🔊 of a wave in relation to observer, moving relative to wave source.
This phenomenon is so prolific that it finds its application in radars, sonography, and even in finding exoplanets 🌍
#TIL #Mathematics— Arpit Bhayani (@arpit_bhayani) May 7, 2019
The theorem we now know as Pythagorean theorem 📐 was described first by a mathematician/priest named Baudhāyana in Baudhāyana Śulbasûtra - a group of Sanskrit texts ✏️ back in 8th century BCE.
#TIL #Astronomy— Arpit Bhayani (@arpit_bhayani) May 6, 2019
We always see the same face of the Moon 🌙
This happens due to a special case of Tidal Locking, synchronous rotation - a situation when object's orbital period matches its rotational period.
Moon takes 28 days to orbit Earth 🌎 and rotate around its axis.
#TIL #History— Arpit Bhayani (@arpit_bhayani) May 4, 2019
Roughly 15000 years ago, humans were hunters 🗡️ and gatherers 🍎 and they mostly fished 🐟 and because of this the most populated places in early history were near the shores 🌊
Fishing was also preferred because it was unlikely to attack and kill 💀
#TIL #Science— Arpit Bhayani (@arpit_bhayani) May 1, 2019
Astrology ☀️ Feng Shui - Vaastu Shastra 🏠 Acupuncture 📌 Graphology ✍️ Palmistry ✋ and many more, are claimed to be sciences, but in fact these are Pseudosciences 👻 they are incompatible with our scientific methods for accepting something as science.
#TIL #Astronomy— Arpit Bhayani (@arpit_bhayani) April 29, 2019
We still do not know how planets are formed? 🤔
One hypothesis - Tidal Downsizing
clump of gas 🌀 abt 10 Jupiters, condenses due to gravity, solid grains collide and settle, grows into massive core 🗿 clump disrupted due to Tidal Forces leaving behind a planet 🌎
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 28, 2019
Roman numerals does not have a ZERO 0⃣instead they used the word "nulla" (meaning none in Latin) 🤯 whenever they wanted to represent 0.#TIL #Mathematics
You can read previously posted TILs at https://t.co/bz7lZddas4
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 27, 2019
The Pythagorean Theorem holds true not only for 2 dimensional triangles but also for higher dimensional solids, like cuboids, and even for non-euclidean spaces🤯
So for 5 dimensions following holds true
a^2 + b^2 + c^2 + d^2 + e^2 = diagonal^2#TIL #Mathematics
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 26, 2019
Hypothetically, if we put all planets, of our solar system, in a big tub of water 🌊 Saturn will be the only one that would not sink, but stay afloat .
It floats because it has density 💪 of 0.7 gm/cm^3, making it lighter than water.#TIL #astronomy
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 23, 2019
The color Magenta does not exist in visible spectrum 🌈 of light, that goes from violet to red 👉 VIBGYOR.
The color is only perceived by our brain 🧠 as mixture of red and violet with absence of green; hence it is all in your head.#TIL #science
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 22, 2019
x% of y is same as y% of x 🤯
This insight is pretty handy ⚒ when one of the two number makes computation simpler.
eg: 63% of 25
Instead of computing 63% of 25, just compute 25% of 63 which is much simpler 🙌#TIL #Mathematics
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 20, 2019
Pluto is not considered as a planet anymore because
- 💪 it does not dominate its neighborhood
- 🌜 it is not "far" larger than its moon Charon (only 2x)
- ☀ its orbit is untidy because it does not sweep up space junk coming in its way#TIL #Astronomy
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 19, 2019
π is so random that frequency distribution 📊 of digits 0-9 in first its 200 billion digits is almost uniform, which means each digit occurs roughly 20 billion times.
This makes π an excellent random number generator 🔢#TIL #Facts #MathIsFun
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 17, 2019
Metacognition is "cognition about cognition" which means knowing 💡 when and how to use particular strategies for learning or problem solving ✔.
Most of the times, understanding the strategies is more fun than solving the problem.#TIL
#TodayILearned— Arpit Bhayani (@arpit_bhayani) April 16, 2019
Coup de grâce is the death blow ☠ to end the suffering of the wounded.
Since the world is more peaceful than the Medieval times ⚔, the literal meaning does not hold but it is still used in metaphorical sense.#TIL
#TodayILearned Madhava of Sangamagrama was the first mathematician 😎 to write a mathematical function as an infinite series. The first set of functions he wrote as infinite series were sin, cos, tan and arctan.— Arpit Bhayani (@arpit_bhayani) April 15, 2019
Read more about this genius here 👉 https://t.co/IaJZJp1TuL#TIL
Babies 👶 till the age of 8 months lack Object Permanence; which means their mind is still nascent to understand the existence of the thing even when they cannot see 👀 or hear 👂it.— Arpit Bhayani (@arpit_bhayani) April 15, 2019
Hence all babies love #peekaboo
Read more here 👉 https://t.co/mYzZV223kw#TodayILearned #TIL