Black holes ⚫️ evaporate, loses mass and energy, due to Hawking Radiation ⚡️— Arpit Bhayani (@arpit_bhayani) July 15, 2019
The process is a staggeringly slow one. It would take about 10^67 years for a black hole the mass of the Sun to evaporate completely.#TIL #Astronomy pic.twitter.com/ZPm0lwowL1
Early Egyptian pyramids were built to please Pharaoh, monarchs 💺— Arpit Bhayani (@arpit_bhayani) July 13, 2019
Pharaoh were intermediary between the gods and the people and it was believed that they became Gods upon their death and hence people spend their entire lives pleasing them.#TIL #History
Goodbye 👋 is a contraction of "God be with ye"— Arpit Bhayani (@arpit_bhayani) July 12, 2019
The phrase "God be with ye" got shorter and shorter, and eventually it became Godby; which then became Goodbye. The change of God to Good was due to confusion with expressions like Good Morning, Good Evening, etc.#TIL #Etymology
The magnetic field 🧲 of Earth is generated as a combination of Earth's rotation about its axis and the electric currents created due to the motion of molten iron 🔥 in the the outer core.— Arpit Bhayani (@arpit_bhayani) July 10, 2019
Earth thus becomes a Dynamo creating magnetic field around the planet.#TIL #Science
3435 is the only finite number in base 10, which is the sum of its digits raised to the power of itself.— Arpit Bhayani (@arpit_bhayani) July 9, 2019
3435 = 3^3 + 4^4 + 3^3 + 5^5
This number is called as Munchausen number, based on a fictional German nobleman who was super narcissistic.#TIL #Mathematics
Our entire universe is filled with a faint uniform radiation, remnant from an early stage of universe, called Cosmic microwave background— Arpit Bhayani (@arpit_bhayani) July 8, 2019
In old TV sets 📺 that worked with an antenna, the sizeable amount of black and white dot screen was due to this radiation#TIL #Astronomy
Ancient Egyptians developed Basin irrigation to make best use of Nile 🌊 and get huge 🌽 surplus.— Arpit Bhayani (@arpit_bhayani) July 6, 2019
During floods, the water would be trapped in basins. Once the soil was full, the water that remained was drained to another basin through a network of drains.#TIL #History
Democracy comes from amalgamation of 2 Greek words dēmos (the common people) and -kratia (rule/strength/power)— Arpit Bhayani (@arpit_bhayani) July 5, 2019
It first appeared in the ancient Greek in the city-state of Athens, which is also the first known democracy of the world - around 6th century BC.#TIL #Etymology
The middle finger 🖕 has been used as a derogatory gesture for at least 2800 years.— Arpit Bhayani (@arpit_bhayani) July 4, 2019
The gesture dates back to ancient Greece and Rome. In those times it was used as a symbol of sexual intercourse, in a manner meant to degrade, intimidate and threaten.#TIL #Misc
Batteries 🔋 are very similar to water tank - more filled they are, more flow you would see— Arpit Bhayani (@arpit_bhayani) July 3, 2019
1.5V battery may be 1.6V when full and 1.2V when almost empty; knowing the output voltage, device looks up how much is energy usually left and then shows it.
- @rahul3103#TIL #Science
Narcissistic number, in love with self, is a number that is the sum of its own digits each raised to the power of the number of digits.— Arpit Bhayani (@arpit_bhayani) July 2, 2019
153 = 1^3 + 5^3 + 3^3;
8208 = 8^4 + 2^4 + 0^4 + 8^4;
There are only 88 such numbers and the largest one is 39 digit long#TIL #Mathematics
Kepler-16b is a planet that orbits not one, but two stars ☀️ and because of this you will always cast two shadows on that planet.— Arpit Bhayani (@arpit_bhayani) July 1, 2019
In a poetic way it is said that Kepler-16b is a place "Where your shadow always has company".#TIL #Astronomy
The word Idea 💡 comes from Greek word "Idein" which means "to see", later started to be used for the word "pattern" and then was adopted in Latin as Idea, as we know it.— Arpit Bhayani (@arpit_bhayani) June 28, 2019
If we think about it, the "idea" is actually foreseeing a pattern 🤔#TIL #Etymology
Sun's ☀️ magnetic field flips its polarity, completely, approximately every 11 years - this phenomenon is called Solar Cycle.— Arpit Bhayani (@arpit_bhayani) June 26, 2019
Hence unlike Earth, Sun's magnetic north 🧲 is not always in its northern hemisphere.#TIL #Science
The world of numbers define friendship in terms of Amicable Numbers, which are pairs of integers, such that each number equals to the sum of the divisors of the other, eg. 220 and 284, making two numbers alike.— Arpit Bhayani (@arpit_bhayani) June 25, 2019
Sum of divisors of 220 is 284 and 284 is 220.#TIL #Mathematics
Panspermia is a hypothesis that supports that the life on Earth 🌍 could have come from the outer space as an intended or unintended contamination by microorganisms 🦠 carried on asteroid, comet ☄️ or even space ship 🛸 more like inter galactic pollination.#TIL #Astronomy— Arpit Bhayani (@arpit_bhayani) June 24, 2019
Higgs Field is the reason things have mass.— Arpit Bhayani (@arpit_bhayani) June 19, 2019
Every elementary particle interacts with this field. More a particle (eg: Electron, Quark, etc) interacts heavier it gets.
Electron interacts the least hence lightest; Photon does not interact at all hence zero mass.#TIL #Science
6174 is known as Kaprekar Constant.— Arpit Bhayani (@arpit_bhayani) June 18, 2019
If you repeatedly subtract the highest and lowest numbers constructed from a set of four digits, not all identical, you will land at 6174 in at most 8 iterations.
4321 - 1234 = 3087;
8730 − 0378 = 8352;
8532 − 2358 = 6174#TIL #Mathematics
There are galaxies receding away 💫 from us at more than a speed of light because of expansion of Space 🍩 in between.— Arpit Bhayani (@arpit_bhayani) June 17, 2019
Thus there will be galaxies light from whose would never reach us no matter how far we went, making them non existent to us.#TIL #Astronomy
In ancient Egypt, the soil around Nile 🌊 was so fertile and rich that people would just toss seeds on the ground and let their cattle 🐄 walk on them.— Arpit Bhayani (@arpit_bhayani) June 15, 2019
Due to weight of the cattle, the seed was pressed into the ground and then after few days plants 🌽 sprouted.#TIL #History
The word Hazard comes from an arabic word al-zahr (the dice) 🎲— Arpit Bhayani (@arpit_bhayani) June 14, 2019
French picked the word as hasart meaning the Game of Dice. As the games were mostly gambling, the sentiment of risk got associated with the word, which was then eventually adopted as Hazard.#TIL #Etymology
Just Room Enough Island is the smallest inhabited island 🏝️— Arpit Bhayani (@arpit_bhayani) June 13, 2019
The total area of the Island is mere 3,300 square feet. The island was purchased by Sizeland family in the 1950s and holds a house, a tree, shrubs, and a small beach; hence the name Just Room Enough#TIL #Misc
Stronger Magnetic 🧲 force near its poles - Why?— Arpit Bhayani (@arpit_bhayani) June 12, 2019
Every force field is a distribution of particles called Virtual Particles. Field strength is proportional to number of these particles.
Near poles the density is higher and it drops exponentially with distance.#TIL #Science
Perfect number is a positive integers that is equal to sum of all its proper divisors.— Arpit Bhayani (@arpit_bhayani) June 11, 2019
Ex: 6 = 1 + 2 + 3
These are so rare that, as of Dec 2018, we only know 51 perfect numbers; all of them are even and largest one has about 50 million (49,724,095) digits.#TIL #Mathematics
Cosmological Redshift is observed when wavelength of light 🕯️ is stretched due to expansion of space through which it is traveling; this makes the light from distant galaxies 📺 redder and proves the expansion of our universe.#TIL #Astronomy— Arpit Bhayani (@arpit_bhayani) June 10, 2019
Clue is derived from the word "clew" meaning Ball of yarn 🏐 in Greek.— Arpit Bhayani (@arpit_bhayani) June 7, 2019
In Greek mythology, Clew, a ball of yarn, was used by Theseus to find his way out of a labyrinth 🧩 Because of this, the word "clew" came to mean something that points the way.#TIL #Etymology
Jupiter does not revolve around the Sun 🌞— Arpit Bhayani (@arpit_bhayani) June 3, 2019
Jupiter 🌐 is so huge and massive that both the Sun and the Jupiter revolves around their common center of mass, called barycenter, which is slightly outside the Sun's surface.#TIL #Astronomy
People in Indus Valley Civilization 🧑👩 were peaceful, and this was inferred from the fact that archeologist found 1500 sites 🏘️ spanning this civilization but almost zero evidence of warfare and almost no weapons 🗡️#TIL #History— Arpit Bhayani (@arpit_bhayani) June 1, 2019
Whiskey 🍸 is the short form of Whiskeybae.— Arpit Bhayani (@arpit_bhayani) May 31, 2019
Whiskeybae comes from the Old English word usquebae, derived from two Gaelic (a Celtic language) words - uisce (water) and bethu (life), literally translating Whiskey to "water of life"#TIL #Etymology
Water 🌊 is an example of Newtonian Fluid which means the viscosity stays constant under pressure 🏋️♀️ There are fluids that do not obey this and are called Non-Newtonian Fluids.— Arpit Bhayani (@arpit_bhayani) May 29, 2019
Ex: Ketchup 🍅 is very viscous at rest but becomes runnier when shaken.#TIL #Science
If you keep on adding digits of a number that is a multiple of 9 (greater than 0), and keep on doing it until you are left with a single digit.— Arpit Bhayani (@arpit_bhayani) May 28, 2019
The single digit that you will have at last will always be 9 🤯#TIL #Mathematics
Our Universe 🌟 is expanding at an enormous rate but it does not have any center of expansion.— Arpit Bhayani (@arpit_bhayani) May 27, 2019
Expansion rate is same at every single point. This was beautifully explained in 1929 by Edwin Hubble. This expansion is very similar to how cake 🥞 rises in an oven.#TIL #Astronomy
Ironically early civilizations 👩🌾 like Indus Valley Civilization, prospered due to floods.— Arpit Bhayani (@arpit_bhayani) May 25, 2019
Floods 🌊 were responsible for depositing nutrient rich silt to the banks of the river making soil ⛰️ very fertile and a perfect place for the crops 🌿 to take roots.#TIL #History
The word "Assassin" 🤺 is a result of centuries of mispronunciation of the word "hashishiyyin" which is the name of a fanatical Muslim sect. The sect during the Crusades smoked hashish and then murdered leaders on the opposing side ⚔️#TIL #Etymology— Arpit Bhayani (@arpit_bhayani) May 24, 2019
Squaring the circle is the problem, proposed by ancient Geometers, of constructing a square ⏹️ with the same area as a given circle ⚫️ In 1882 this task was proven to be impossible, as a consequence proved that pi (π) is a transcendental number.#TIL #Mathematics— Arpit Bhayani (@arpit_bhayani) May 21, 2019
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