Book review – The Number Devil: A mathematical adventure

It is from the genre of fiction. The stories are fabricated around two characters of Robert and Number Devil ๐Ÿ˜ˆ.

Watch the video for my detailed review.


Hexagon art

Let’s make hexagonal area interesting ๐Ÿ˜Š

In geometry, hexagonal area appears often boring to me. But actually, it can be really fun. We can experiment various patterns over the area of hexagon.

This pattern can be used to decorate walls, doors, fridge magnets, etc with multiple colours.

Allow your imagination go beyond its limitations and experiment it, to make unique masterpieces of your own.


Why clouds don’t fall?

Have you ever wondered that even though it rains down but why the clouds do not fall ๐ŸŒจ? This thought often bothered me during rainy days in my childhood.

But one day, when I was reading a book ๐Ÿ“– ‘ That’s Maths The Mathematical Magic in Everyday Life’ by ‘ Peter Lynch’, I came across the same question so I got involved quickly reading it further. Afterall, it had been my long-time curiosity.

It stated that it was George Gabriel Stokes, a great mathematician and physicist who explained this concept.

Clouds are formed of small and large droplets. He investigated that small droplets are suspended in the air due to internal friction of fluids.

Actually, there are two forces acting on droplets- gravitational force and drag force by air. The drag force needed to move the particle through a viscous medium is given by Stokes law

F = 6 ฯ€ ฮท R v


ฮท is viscosity

R is radius of sphere

v is velocity

Drag force acts due to the warm air rising from surface of earth by heat of the sun.

In case of small droplets, the drag force of air dominates over gravitational force whereas for large droplets, the gravitational force dominates over drag force of air.

Hence large droplets fall as rain whereas small droplets are suspended in the air in the form of clouds.


Mathematical modelling of Covid-19

Many mathematicians and physicists are projecting various things using mathematical models such as

1. Number of Covid-19 infections expected in a country, region or a city with or without various measures initiated by the government.

2. Number of ICU beds, ventilators and other elements of health infrastructure required

The need of the hour is to flatten the curve representing hospital admissions due to Covid-19.

According to the calculations of Samit Bhattacharya, a mathematical modeller and an associate professor of mathematics, the Corona virus had a reproductive number of 2.2 to 3 in Wuhan in the initial stages. If reproductive number > 1, the epidemic is spreading exponentially.

To bring this epidemic under control, it should be reproductive number < 1




Go down deep enough in anything and you will find mathematics

– Dean Schlicter

If you do not know something in a math problem, then Algebra can help by using letters and symbols. Their values can be calculated by using the known things.

Algebra is derived from the Arabic word ‘al-jabr’, that means the “reunion of broken parts.”


  • Algebra helps computers and Artificial Intelligence (AI) in controlling vehicles without drivers.
  • Medical practitioners figure out the required dosage of medicine by assessing a patient’s illness and general health, different effective drugs and any other factor that affects patient’s recovery.

Maths Tutors

Are you passionate about Maths? And if I add that you can earn money through this passion, isn’t it really amazing? Yes, it’s really possible. There are dozens of legit websites through which you can really make good amount of money๐Ÿ’ฐ. The only thing you need to pour is your dedicated hardwork. You can even make this side hustle as your full time career as your career starts growing. There are various websites through which you can help students in their maths assignments/homework and also teach them.

1. Chegg India

2. Lido learning

3. Preply

4. Teacheron

5. Udemy

6. Teachable


8. tcyonline

9. Upwork

10. Freelancer

11. Vedantu

12. Yup

13. Transtutors

14. Skooli


16. HashLearn

17. Vidyalai

18. Expertsmind

19. Learn Pick

20. Tutorhub