2017-07-16 (Sunday)

Today, I learned that:

This is post # 150 of my blog. So let us celebrate with a good piece of grilled meat!

Carne para churrasco

Dalolio, a popular store meat store in Paranavaí, PR, Brazil. People line up to buy meat for the weekend, either raw for them to grill it themselves or already grilled meat, from one of the big smokers to the left. Photo taken on 2017-04-23.

The photo above shows people lining up to buy the main ingredient for their Sunday lunch, the meat. During the week, this popular store sells only raw meat, but on Sundays there are also the big smokers you can see on the left side of the photo, so that its patrons can enjoy their lunch without the need for grilling the meat themselves. It was taken on 2017-04-23 in Paranavaí, PR, Brazil.

But people do not live only off food, the soul needs its take, as well. However, another store in the same city, which main activity is to sell religious articles, also offers grilled food, true to their motto ‘Burger and Bibles’. See for yourselves below:

Body and soul

Lunch is being prepared outside the store for religious articles. Photo taken on 2017-07-14.

Maybe you remember my post in the beginning of this year, 2017-01-29 ?  In it I showed that there is a movement in the US state of California which aims to break away from the US federation. Since I had not heard so much about it afterwards, I decided to take the opportunity and ask the former correspondent for Radio Sweden in New York, Agneta Furvik, during her radio program last Thursday, when her listeners could call in (or send a message) and ask about anything they want to know about USA. By her side, Agneta had other experts in American matters: American political scientist, Katherine Angelo Hanly; Professor of North American studies at Uppsala University, Dag Blanck; and her former colleague as correspondent in Washington DC, Inger Arenander. You can see them and hear their opinions (in Swedish) in reference # 1 below.

For those of you who do not understand Swedish, I can summarise that neither of them believes that there is any major risk of a Calexit in 2019.

… That’s what I learned in school !

Refs.:
1: Lyssnarfråga: Kan Kalifornien lämna USA?

*: What did you learn in school today ?

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2017-07-05 (Wednesday)

Today, I learned that:

Finally, we are about to have an international system of measures that will be based entirely on Mother Nature. I am of course talking about the International System of Units (SI system), which has its origin in 1875, when the two references for length and mass were decided. It has ever since grown to comprise seven base units, of which six are derived by using natural phenomena. See references #1, #2, and #3 below. The following illustration is contained in the last of those references, and it also develops the matter further in an elegant way:

7bases

However, the seventh base unit, the kilogram, is still an object manufactured in 90 % platinum and 10 % iridium. It is kept in a safe in Paris and has copies spread out over the world. There are several negative remarks that can be made to such a procedure, the difficulty of accessing the object, the wear and tear that the atmosphere exercises on the object, etc. So, if everything goes as expected, in November 2018, there will be a congress deciding to abandon the physical mass reference and substitute it with something based on non-changing conditions.

The new reference will be based on Planck’s constant. A highly precise balance operates on the principle of electromagnetic force compensation. In it, a weight on one side is balanced by the electrical force on the other. This electrical force is linked to Planck’s constant and can therefore be directly referred to as the new kilogram definition. See reference #4 below.

And while they are still at it, how about also changing the base unit from something which includes a prefix (as you know kilo means 1000) to a neutral one? My suggestions is that the seventh base unit should be named planck, abbreviated P, to which the normal prefixes would be used, when necessary. For instance, gram (g) would be mP (milliplanck) and the ‘metric’ ton, currently 1000 kg, would be 1 kP (kiloplanck). In the old CGM system of measures, there is a P which standards for Poise, the unit for dynamic viscosity, but in the SI system it has already been substituted by Pa.s (pascal-second), where 1 Pa.s = 10 P.

The photo below was taken in the strait of Kattegat on the Danish side on 2017-05-25, when I flew from continental Europe to Gothenburg. It shows the Danish wind farm close to the island of Anholt, one of the ten biggest in the world. Due to the altitude, it may be difficult to see, but each one of those small white spots is a wind turbine. See also reference #5 below.

Sol_vind_vatten

A large Danish wind farm, located in the sea between Denmark and Sweden, close to the island of Anholt. Photo taken on 2017-05-25.

Since this time of the year is appropriate for many people in Europe to take vacation, what could be better than “sol, vind och vatten” (sun, wind, and water), which the fantastic Swedish song writer Ted Gärdestad described so well in reference #6 below?

And did you know that renewable energy is the cheapest one to acquire? According to professor Tomas Kåberger of Chalmers, it occurred already in 2016! An article describing that and many other interesting correlated facts can be found in reference #7.

… That’s what I learned in school !

Refs.:
1: International System of Units

2: Para manter o peso

3: SI base units

4: Researchers developing a new balance for the new kilogram

5: Wind farm

6: Sol, vind och vatten

7: Njutbar nedgång för priset på förnybar energi

*: What did you learn in school today ?