Euler’s identity is often cited as an example of deep mathematical beauty.

*Constance Reid*: Euler’s identity is “the most famous formula in all mathematics”.

Euler’s Identity is a special case of his formula from complex analysis suggested by Swiss mathematician *Euler* in 1748.

The identity links five fundamental mathematical constants:

- The number
**0** - The number
**1** - The number
**π**(**π**= 3.141 . . .) - The number
(**e**= 2.718 . . .)**e** - The number
, the imaginary unit of the complex numbers.*i*

Euler’s Identity “is absolutely paradoxical; we cannot understand it, and we don’t know what it means, but we have proved it, and therefore we know it must be the truth”. – *Benjamin Peirce*.

Aplusclcik team chose 17 Best Puzzles of 2017.

They are:

What country has the lowest birth rate in the World?

If certain words in this question are spelt wrong, how many of the eighteen words are spelt wrong?

A claustrophobic gentleman chooses his place in the train that will enter a tunnel just after the station. Where is the best place for him?

Read more at

]]>2011 England Survey: **49 of 100** adults lacked of numeracy Level 1 skills (fractions, percentage, and decimals). *The figure is only shocking for 51% of population.*

OECD reported (PIAACX2012) that **forty percent** of USA young people aged 16-19 were below Level 2.

This is statistics. Statistics is a part of mathematics and it is about **us** as a group.

There are two categories of people who can and who cannot do numbers.

Are You in a category of people who are comfortable with numbers? Check / train yourself at the website A+Click

]]>Four steps of the Feynman technique are

- Write down everything new you learn about a subject in a notebook.
- Pretend to teach the topic in a classroom. Try to explain in a simple way.
- Go back to the books when you get stuck.
- Simplify and use analogies that everybody knows and understands.

“There is no better way to learn than to teach.” – Benjamin Whichcote

]]>**2 ^{57,885,161} – 1 **

is one of the Mersenne primes that can be written in form 2^{n} – 1, where n is an integer. They are named after 17-century French mathematician Marin Mersenne.

The number written in the decimal form contains 17 million digits.

]]>a^{2} + b^{2} = c^{2}

The tabet is known as the world’s oldest trig table. Babylonians used the base-60 numbers, which permitted many more accurate fractions than the contemporary base 10. For example, 2/3 = 0.6666… (or 40 minutes) was a finite number. The base-60 system were inspired from such shapes as a circle and the regular hexagon (see an example).

]]>According to the new World Economic Forum Report “The Future of Jobs” the most required skill is ** Complex Problem Solving** together with Creativity and Critical Thinking.

Train yourself! Start with simple problems, for example, at Aplisclick, do it regularly and grow your most important skill.

Daan Roosegaarde uses technology and creative thinking to produce imaginative, earth-friendly designs and highlights the importance of the problem solving skills.

“There are no passengers on spaceship earth. We are all crew.” – Marshall McLuhan

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Certain scientists think that love is a chemical state of mind and the formula for love is as follows:

dopamine + seratonin + oxytocin

C_{8}H_{11}NO_{2} + C_{10}H_{12}N_{2}O + C_{43}H_{66}N_{12}O_{12}S_{2}

How many atoms are there in the formula of love?

]]>Why we frequently use number 7?

Why there are seven days of week? seven deadly sins? seven wonders? . . . .

Look for the answer in the night sky or at aplusclick.org

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