Uranus was the first planet ๐ that was discovered with a telescope ๐ญ#TIL #Astronomy

— Arpit Bhayani (@arpit_bhayani) May 20, 2019

Barbarian, currently used for Uncivilized or primitive ๐บ, 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 ๐ when the light ๐ฆ reflected from it reaches your eye. But you understand this light (encoded in electric signals) when it reaches your brain ๐ง

— Arpit Bhayani (@arpit_bhayani) May 16, 2019

This process of understanding light signals takes about 0.15-0.2 seconds โฒ๏ธ#TIL #Misc

How Ozone absorbs UV rays? โ๏ธ

— 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 โ ๏ธ UV#TIL #Science

Why is Area of triangle ๐ 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 #Astronomy

— Arpit Bhayani (@arpit_bhayani) May 13, 2019

One day on Venus is longer than its one year ๐

Venus takes 224.7 Earth days to orbit it around the sun but it takes 243 Earth days to complete one rotation.

#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 ๐ผ๏ธ Music ๐ถ and Storytelling ๐ง

This was found by studying fossil remains; their bones and teeth were healthier than agriculturists ๐

#TIL #Etymology

— Arpit Bhayani (@arpit_bhayani) May 10, 2019

Where did the word "rice" come from?

rice => French ris => Italian riso => Latin oriza => Greek oryza => Pashto vriลพe => Sanskrit vrihi-s เคตเฅเคฐเฅเคนเคฟ ๐ฎ๐ณ

#TIL #Misc

— Arpit Bhayani (@arpit_bhayani) May 9, 2019

There exists Half QWERTY keyboards designed for mobile phones ๐ฑ where 2 characters (ex: Q and W) share the same key.

Nokia ๐ค 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 ๐ 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 ๐

#TIL #Mathematics

— Arpit Bhayani (@arpit_bhayani) May 7, 2019

The theorem we now know as Pythagorean theorem ๐ was described first by a mathematician/priest named Baudhฤyana in Baudhฤyana ลulbasรปtra - a group of Sanskrit texts โ๏ธ back in 8th century BCE.

#TIL #Astronomy

— Arpit Bhayani (@arpit_bhayani) May 6, 2019

We always see the same face of the Moon ๐

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 ๐ and rotate around its axis.

#TIL #History

— Arpit Bhayani (@arpit_bhayani) May 4, 2019

Roughly 15000 years ago, humans were hunters ๐ก๏ธ and gatherers ๐ and they mostly fished ๐ and because of this the most populated places in early history were near the shores ๐

Fishing was also preferred because it was unlikely to attack and kill ๐

#TIL #Etymology

— Arpit Bhayani (@arpit_bhayani) May 3, 2019

The word robot ๐ค comes from the Czech word robota which means "forced labor".

#TIL #Misc

— Arpit Bhayani (@arpit_bhayani) May 2, 2019

Public transport ๐ is entirely free for residents of the Estonian capital, Tallinn ๐คฏ

#TIL #Science

— Arpit Bhayani (@arpit_bhayani) May 1, 2019

Astrology โ๏ธ Feng Shui - Vaastu Shastra ๐ Acupuncture ๐ Graphology โ๏ธ Palmistry โ and many more, are claimed to be sciences, but in fact these are Pseudosciences ๐ป they are incompatible with our scientific methods for accepting something as science.

#TIL #Mathematics

— Arpit Bhayani (@arpit_bhayani) April 30, 2019

The prime numbers that end in 2 and 5 are in fact 2 and 5 ๐คฏ

#TIL #Astronomy

— Arpit Bhayani (@arpit_bhayani) April 29, 2019

We still do not know how planets are formed? ๐ค

One hypothesis - Tidal Downsizing

clump of gas ๐ abt 10 Jupiters, condenses due to gravity, solid grains collide and settle, grows into massive core ๐ฟ clump disrupted due to Tidal Forces leaving behind a planet ๐

#TodayILearned

— Arpit Bhayani (@arpit_bhayani) April 28, 2019

Roman numerals does not have a ZERO 0โฃinstead they used the word "nulla" (meaning none in Latin) ๐คฏ 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 spaces๐คฏ

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 ๐ Saturn will be the only one that would not sink, but stay afloat .

It floats because it has density ๐ช of 0.7 gm/cm^3, making it lighter than water.#TIL #astronomy

#TodayILearned

— Arpit Bhayani (@arpit_bhayani) April 25, 2019

The word Hundred ๐ฏ comes from the old Norse term hundraรฐ, roughly translated as "a long hundred", being equivalent to 120 and not 100 ๐คฏ#TIL #Etymology

#TodayILearned

— Arpit Bhayani (@arpit_bhayani) April 24, 2019

Neutron star is so dense that even a teaspoonful of it would weigh around 6 billion tons ๐๏ธโโ๏ธ

Density of a neutron star stands at 10^17 kg/m^3#TIL #astronomy

#TodayILearned

— Arpit Bhayani (@arpit_bhayani) April 23, 2019

The color Magenta does not exist in visible spectrum ๐ of light, that goes from violet to red ๐ VIBGYOR.

The color is only perceived by our brain ๐ง 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 ๐คฏ

This insight is pretty handy โ 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 ๐#TIL #Mathematics

๐ https://t.co/p8eIkclNzj

#TodayILearned

— Arpit Bhayani (@arpit_bhayani) April 21, 2019

Pythagoras, the great mathematician, refrained from eating beans because, during those times, it was believed that eating a bean was akin to eating human flesh.#TIL #Misc

#TodayILearned

— Arpit Bhayani (@arpit_bhayani) April 20, 2019

Pluto is not considered as a planet anymore because

- ๐ช it does not dominate its neighborhood

- ๐ it is not "far" larger than its moon Charon (only 2x)

- โ 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

ฯ is so random that frequency distribution ๐ of digits 0-9 in first its 200 billion digits is almost uniform, which means each digit occurs roughly 20 billion times.

This makes ฯ an excellent random number generator ๐ข#TIL #Facts #MathIsFun

#TodayILearned

— Arpit Bhayani (@arpit_bhayani) April 18, 2019

The word Sugar was derived from Sanskrit word เคถเคฐเฅเคเคฐเคพย โขย (ลarkarฤ) which means Candied Sugar ๐ฌ#TIL

#TodayILearned

— Arpit Bhayani (@arpit_bhayani) April 17, 2019

Metacognition is "cognition about cognition" which means knowing ๐ก when and how to use particular strategies for learning or problem solving โ.

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 grรขce is the death blow โ to end the suffering of the wounded.

Since the world is more peaceful than the Medieval times โ, the literal meaning does not hold but it is still used in metaphorical sense.#TIL

#TodayILearned Madhava of Sangamagrama was the first mathematician ๐ 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 ๐ https://t.co/IaJZJp1TuL#TIL

Babies ๐ถ 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 ๐ or hear ๐it.

— Arpit Bhayani (@arpit_bhayani) April 15, 2019

Hence all babies love #peekaboo

Read more here ๐ https://t.co/mYzZV223kw#TodayILearned #TIL