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How India can move to digital economy ?

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Scope :  On 8 November 2016, the Government of India announced the demonetisation of all ₹500 and ₹1,000 banknotes of the Mahatma Gandhi Series.Of Rs 15.41 lakh crore (15.4 Trillion)  demonetised currency notes of Rs 500 and Rs 1,000 denominations, only Rs 10,720 crore (100 Billion) did not reach to the banks or the RBI.This means only 0.7 per cent of demonetised currency notes were junked in the exercise.  This showed how good idea executed poorly end up in disaster for poor people.  Demontisation was done to bring back all black money and let people more to digital transactions but as mentioned above , black money objective didn't achieve and amount of digital transaction increased during during that period but decreased with time. Action items :  Demonetize big currency notes like 1000 or 500 or 200. Only small currency notes should be in service ( 1 paise , 10 paise , 1 Rs , 10 Rs , 100 Rs Only ).  Enough time like 3months to 6months must be given for p...
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How to go to space from the surface of the planet ?

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  Reusable rockets Scope : Anyone living in 2021 knows this scope of this technology. Whether SpaceX or Blue origin are simple examples and leading the way is Elon Musk's SpaceX. Principle is simple to recover all the stages and reuse by fuelling them again just like aeroplane works. As if today we are able to recover the first stage of the rocket only , 2nd or the 3rd stage is burned away in the atmosphere. Recovering the 2nd/3rd stage or complete rocket 100% is still challenging. It took almost 10yrs of development to be able to recover 1st stage. Recovering the upper stage is challenging as it travels with the speed of the bullet and would have little or no fuel to pull it back to ground to reuse it. Options :  Recover 100% rocket by building only 1 stage rocket , like a glide rocket. Launched in the form of rocket but recovered in the form of airplane landing. Reuse the upper stage in orbit to build a space station or spaceship by refuelling it to travel exploratory missio...
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Challenges to "Over to Air (OTA)" updates for automotive vehicle

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  1 - The advantages and disadvantages of using OTA and why they adopted this function. OTA started with the first personal computers in late 90's with windows / macos , then moved to smartphones and then to the automotive world where Tesla was the first company followed by Mack trucks , GM , BMW etc. Now more and more companies are working on it and in future more devices will follow OTA updates. Regarding the automotive world, OTA brings the following advantages and disadvantages. Advantage : A : Efficiency - OTA updates are  more efficient way to fix bugs and update software than to manually update each individual device. OEM can seamlessly update the firmware to the whole fleet without physically checking. OTA updates also enable OEMs to more easily update software on devices that are difficult to access, such as ECU or dashboards or infotainment systems etc. B : Development timing reduction - OTA updates can catch issues before devices launch, which can save OEMs time an...
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GOOGLEFINANCE : Function Usage to create Googlesheet Stock Protfolio

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    Lower Bollinger band Value :  = average ( query ( sort ( GoogleFinance ( " NASDAQ:AAPL", "close" , TODAY ( ) - 320 , TODAY ( ) ) , 1 , 0 ) , "select Col2 limit 20 " ) ) - STDEV ( query ( sort ( GoogleFinance ( " NASDAQ:AAPL" , "close" , TODAY ( ) - 320 , TODAY ( ) ) , 1 , 0 ) , "select Col2 limit 20 " ) ) * 2 Upper Bollinger band Value :  = STDEV ( query ( sort ( GoogleFinance ( " NASDAQ:AAPL" , "close" , TODAY ( ) - 320 , TODAY ( ) ) , 1 , 0 ) , "select Col2 limit 20 " ) ) * 2 + average ( query ( sort ( GoogleFinance ( " NASDAQ:AAPL" , "close" , TODAY ( ) - 320 , TODAY ( ) ) , 1 , 0 ) , "select Col2 limit 20 " ) ) All Values : = INDEX ( GoogleFinance ( "NASDAQ:AAPL" , "All" , WORKDAY ( TODAY ( ) , - 5 ) , TODAY ( ) ) , , ) Date Open High Low Close Volume 1-Feb 133.75 135.38 9-May 134.14 106239823 2-Feb 135.73 136.31 13-May 134.99 8...
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