How to make an espresso / cappuccino freddo

So you went for vacations in Greece or Cyprus or southern Italy and liked the cold coffee they serve there? Or maybe you have a Greek colleague who’s busting your balls non stop about how great cold coffee is, and just want him to shut up? You’re at the right place!

These recipe is for both espresso freddo and cappuccino freddo which are exactly the same thing; you just add cold foam milk on top of the espresso freddo to make the cappuccino version.

Over the years I’ve tried to simplify the recipe a bit. It’s not barista-level good, but anyone who’s tried it tells me it’s pretty decent.

To begin with, here’s the equipment you need:

  • A strong coffee mixer. This is an absolute must, you can’t do without it. Outside of Greece they are called “drink mixers” (you can find them in amazon.de for example). They look like this:

mixer

 

  • One or more suitable tall glasses. You need them to be around 200-250 ml for espresso freddo and 300-350 ml for cappuccino freddo. The ones from IKEA are fine.

Trinkglas

 

  • Two cocktail shakers, one for the milk and one for the coffee. It’s ok if you don’t have shakers though, you can just use normal glasses. But you can also buy them from amazon.de.

shaker

Now let’s see the stuff you need to prepare every time before you make cold coffee.

  • I’m sure you’ll be surprised to learn that you need coffee! Basically you need a double espresso, around 100ml. What I usually do is use the Lungo capsules for my Dolce Gusto machine, and set it to 3 lines instead of 4.
  • You also need straws, medium or thin ones. Don’t get the thick ones, they’re good for smoothies but not cold coffee.
  • You need ice cubes. For every coffee, you need 5-6.
  • If you’re going to make cappuccino (not espresso) freddo, you need milk, and you need it cold. Let me say that again, because it’s really really important: COLD. Ideally it should be 2 degrees. That means that you need to put it at the back of the fridge, not at the door where it’s a bit warmer. I usually put it in the refrigerator about 10min before I start. Keep it in the fridge until the moment you actually need it.
    You also need to experiment a bit with the kind of milk you’ll use. I’ve found that the best one -at least from the ones you find in a regular supermarket- is full fat UHT milk, 3.5%. The one you get at the fridge of the supermarket isn’t as good –no idea why. If you find a “barista milk” get it; they have more proteins so they froth better.
  • One of the shakers, the one to use for milk, has to be really, really cold. Put it in the refrigerator for at least an hour before making the coffee.

The basic idea is that, in order to make the foam milk, the milk has to be cold and stay cold. That’s why you need its container to also be frozen.

Now that we’ve prepared everything, let’s get to work.

  • The first thing you need to do is prepare the coffee. If you also want sugar, you need to add it immediately afterwards, while the coffee is still hot, and stir it a bit with the mixer; that way it will melt nicely and you won’t get the awful crunchy feeling of unmelted sugar.
  • Now we need to get our coffee ice cold. Put 5 or 6 ice cubes in the shaker or glass. Pour the coffee swiftly over the ice cubes. Stir it a bit with the mixer, but too much, you don’t want it to turn into foam. 5-6 seconds should be enough. Then pour everything (coffee+ice cubes) in the glass. 
  • If you want an espresso freddo, you can add a straw and stop here, you’re done. Otherwise you have one more step to prepare the cold foam milk. 
  • Get the milk and the 2nd shaker (or glass) out of the fridge. Fill the shaker just below half full. Stir it with the mixer for some time (at least 30 sec, can be more) until the surface is smooth and free of bubbles. This part is exactly why the shaker has to be cold. If it’s not, it will warm up the milk and it will be impossible to turn into foam.

Pro (well, sort of) tip: when holding the shaker with the milk and stirring, try to grab it from the top, not the middle or the bottom. That way the heat from your hand will affect the milk as little as possible.

The result should, ideally, look like this:

Αποτέλεσμα εικόνας για καπουτσινο φρεντο

The water -always with ice cubes!- is mandatory. The beach isn’t, but it’s a very nice addition 😉

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Oracle PL/SQL: how is AND evaluated?

Coders used in C#, Java etc. know there are two ways to evaluate a logical AND. In C# you can do either

if (test1) & (test2)
{
  // whatever
}

or

if (test1) && (test2)
{
  // whatever
}

The difference, of course, is that in the first case (&) BOTH test1 and test2 are evaluated. This doesn’t matter much if test1 and test2 are variables, but it matters a lot if they’re methods. This of the following example:

if (reserveItemsForOrder()) && (sendOrderToErp())
{
  // whatever
}

In this fictional case, && means that the order will be sent to the ERP system only if items can be reserved. If the single & is used, however, it will be sent anyway –even if not enough stock can be found.

This is well known in languages like C, C++, C#, Java etc. But how is AND evaluated in Oracle?

In short, it’s the same as &&. But for a more complete explanation, let’s read it from Oracle itself:

Short-Circuit Evaluation

When evaluating a logical expression, PL/SQL uses short-circuit evaluation. That is, PL/SQL stops evaluating the expression as soon as the result can be determined. This lets you write expressions that might otherwise cause an error. Consider the following OR expression:

DECLARE

on_hand INTEGER;
on_order INTEGER;
BEGIN
..
IF (on_hand = 0) OR ((on_order / on_hand) < 5) THEN

END IF;
END;

When the value of on_hand is zero, the left operand yields TRUE, so PL/SQL need not evaluate the right operand. If PL/SQL were to evaluate both operands before applying the OR operator, the right operand would cause a division by zero error. In any case, it is a poor programming practice to rely on short-circuit evaluation.

 

 

Creating graphs with Gnuplot… for dummies

As part of an investigation project at work, we had to create a number of graphs. Of course our first idea was using Excel; but it turns out that in a lot of scenarios it’s ambiguous, time consuming and sometimes outright frustrating. So we ended up doing it with Gnuplot, which provided a much better experience.

This article is not meant to give extended coverage of course; there are many FAQs and other documents available online for that (a small collection is given at the end of the article). It’s meant to cover basic usage and some common scenarios, namely:

  • How to download and install
  • How to plot a simple function
  • How to plot data points from a file
  • How to plot multiple functions and/or data points
  • How to setup the plot (axes etc.)
  • How to fill the area between functions
  • How to export the plot for MS Office
  • How to plot using batch files
  • Links and FAQs

Gnuplot is a really powerful tool. This article won’t cover many things, like 3D plots, polar coordinates, binary data, financial-style graphs and others; take a look at the demo library for that (link given at the end).

How to download and install

Download is provided from Sourcefourge. Go to http://www.gnuplot.info/download.html and get the current version.
After downloading, installation is pretty easy and straightforward. Just click “next” in every step and you’ll be ok.

After installation, start Gnuplot from the desktop icon. You’ll get a command prompt (gnuplot>).

How to plot a simple function

A major problem with MS Excel is that you cannot create a graph for a function; you have to create the data in cells, using a formula. And of course, the values will not be continuous but discrete.

So let’s say you want to make a graph of a function f(x)=x^2+10/x, for values of x between -10 and 10. Enter these commands to the command prompt, pressing ENTER after each line (lines that begin with # are comments):

# setup the x axis range
set xrange [-10:10]
# plot our function
f(x)=x**2+10/x
plot f(x)

To change the line color, the easiest way is to use one of the available linestyles:

plot f(x) linestyle 3

 

In order to see the readily available linestyles, just enter:

test

 

How to plot data points from a file

For our example, we have two text tab-separated files, c:\temp\out1.txt and c:\temp\out2.txt, that look like this:

out1.txt

1 30
2 30
3 30
4 30
5 30
10 200
20 200
30 200
40 200
50 200
100 500
200 500
300 500
400 500
500 500
900 500

out2.txt

1 TS 5.3 3.5
2 TS 4.2 7.4
3 TS 6.1 7.3
4 RS 0.9 2.1
5 RS 1.2 2.2
6 RS 0.8 1.9
7 TS 4.9 3.1
8 TS 5.7 2.8
9 TS 4.4 3.4

The first has just two columns, x and y. The second has four columns: the second is labels on x, the third and fourth are measurement values (y) and the first an incremental number (for gnuplot to know which comes first, second etc.)

Let’s plot the first one:

# make sure we're in the correct dir
cd 'c:\temp'
set xrange [0:1000]
set yrange [0:1000]
plot 'out1.txt' using 1:2

Note the 1:2 here. This tells gnuplot that the 1st column of the file will be used for x and the 2nd for y.

If you want to connect the points, the last line would be:

plot 'out1.txt' using 1:2 with lines

If instead of simply connecting the points you would need to do a ‘best fit’ with a given function, say g(x)=a*x+c :

g(x)=a*x+c
fit g(x) 'out1.txt' using 1:2 via a,c
# here you get a list of the calculations gnuplot is doing, the parameters used and the standard error
plot 'out1.txt' using 1:2, g(x)

Of course, that’s not a very accurate fit, but that’s not our point here (smile)

Let’s now plot the second file. Our goal here is to create a bar chart:

cd 'c:\temp'
# 'set autoscale' automatically sets ranges for x,y
set autoscale
set boxwidth 0.5
set style fill solid
plot 'out2.txt' using 1:3:xtic(2) with boxes

Note the 1:3:xtic(2). This tells gnuplot that the 1st column is ot be used for x, the 3rd for y and the 2nd (xtic(2)) for x-axis labels.

Now let’s try to plot two data series in the same bar chart:

cd 'c:\temp'
set style data histogram
set style histogram cluster gap 1
set style fill solid border -1
set boxwidth 0.9p
plot 'out2.txt' using 3:xtic(2) title 'Measurement 14-Feb-2014', 'out2.txt' using 4:xtic(2) title 'Measurement 17-Feb-2014'

How to plot multiple functions and/or data points

Actually we did that already in the example with the fit and bar examples. We just have to give multiple functions/files and separate them with a comma. As an example:

cd 'c:\temp'
a=5
f(x)=a*x
plot f(x), 'out1.txt' using 1:2

Let’s add a line and a legend, shall we ? The last line will become:

plot f(x) title 'My function', 'out1.txt' using 1:2 with line title 'My data'

How to setup the plot (axes etc.)

# Chart title
set title 'Workflow performance (AWTs/sample)'
# Get the legend out of the chart
set key outside
# place the legend
# here you can use 'left', 'right', 'center' and 'top', 'bottom', 'cent'
set key right cent
# Setup the axes range using, e.g.
# From-to
set xrange [1:500]
set yrange [1:1000]
# logarithmic
set logscale x
set logscale y
# axes titles
set xlabel 'Samples'
set ylabel 'AWTs per sample'
# let's see what we've done
replot

How to fill the area between functions

What if you want to fill the area below a curve, or between two curves ?

First, let’s fill the area between a curve f(x)=x^2 and the x axis:

set xrange [0:10]
# c(x) is the same as the x axis
c(x)=0
f(x)=x**2
# '+' is the pseudofile, you can read about it in the documentation
plot '+' using 1:(c($1)):(f($1)) with filledcurves closed linestyle 3 title 'Filled area'

After this, it should be obvious how you can fill the area between two curves; just use a function instead of c(x)=0. Let’s say we use g(x)=x^1.8

set xrange [0:10]
g(x)=x**1.8
f(x)=x**2
plot '+' using 1:(g($1)):(f($1)) with filledcurves closed linestyle 4 title 'Area between two functions'

How to export the plot for MS Office

Although of course you can do a printscreen, the best format to use with Word, Powerpoint etc. is the Enhanced Metafile Format (.emf). The best thing about it is that it’s scalable. Surprisingly, if you have a .emf image and preview it (Windows uses Paint by default) it seems awful; but if you insert it in Word it looks great.

So, in order to create a plot and get it as an .emf you need to do something like this:

# output directory and file name
cd 'c:\temp'
set terminal emf enhanced
set output 'plot.emf'
# create the plot
set xrange [-100:100]
f(x)=x**2-10*x
plot f(x) title 'f(x)=x^2-10x'
# because of 'set output' above, plot creates
# the file on disk instead of showing it on the screen
# NOTE: until you 'unset output', the plot file (.emf, .pdf, whatever)
# is locked and cannot be accessed
unset output
# normally you need to return the plot output to the screen
set terminal wxt

How to plot using batch files

Creating a batch file is useful in several scenarios. For example, you might have a data file (like out1.txt above) which changes every day; and every day you need to create the same graph, but with the fresh data.

So in order to do this, just write all gnuplot commands to a text file and execute it with gnuplot.exe. See the example below (the backslash means that the line is continued):

C:\temp\dailychart.plt
cd 'c:\temp'
set terminal pdf enhanced
set output "plot.pdf"
f(x) = 980/x
c(x) = 650
plot \
f(x) title '980 limit' linestyle 1, \
c(x) title '2 sec limit' linestyle 2, \
'out1.txt' using 1:2 title 'External data' linestyle 3, \
'out2.txt' using 1:3 title 'External data 2' linestyle 4
unset output
quit

The .plt extension is the gnuplot default, but you can name the file anything (e.g. .txt). Now open a Windows command prompt and type:

"C:\Program Files (x86)\gnuplot\bin\gnuplot.exe" c:\temp\dailychart.plt

Links and FAQs

By far the best resource is the demo scripts library. Here you can find almost anything and adapt it for your scenario.

Demo scripts for gnuplot (with images of output)

http://www.gnuplot.info/demo/

gnuplot Quick Reference (.pdf)

http://www.gnuplot.info/docs_4.0/gpcard.pdf

Plotting functions

http://www.gnuplotting.org/plotting-functions/

A Brief Manual and Tutorial

http://people.duke.edu/~hpgavin/gnuplot.html

gnuplot FAQ

http://www.gnuplot.info/faq/faq.html

Official gnuplot documentation

http://www.gnuplot.info/documentation.html

How many coffee capsules is it safe to drink per day?

I’ll concentrate on Dolce Gusto capsules for the simple reason that that’s what I have at home (well, that, plus a Krups filter coffee machine, plus an Izzy traditional espresso machine, plus my one-time favorite Bialetti brikka). The results for Nespresso et. al. should be similar.

dolce-gusto-capsules

Do note that I’m only considering caffeine content; but that’s not always the only factor. E.g. if you drink anything near 400 cups Lungo decaffeinato in a single day, you will have non-caffeine related problems (WC attendance comes readily to mind ! 😊).

So, straight from Nestle’s faq:

How much caffeine is in each of the drinks?

Specialty Coffee :
– Cappuccino : 107 Mg Caffeine
– Cappuccino Skinny : 90 Mg Caffeine
– Latte Macchiato : 85 Mg Caffeine
– Vanilla Latte Macchiato : 83 Mg Caffeine
– Caramel Latte Macchiato : 83 Mg Caffeine
– Latte Macchito Skinny : 83 Mg Caffeine
– Mocha : 45 Mg Caffeine
– Cappuccino Ice : 35 Mg Caffeine

Coffee Drinks :
– Caffe Grande Intenso : 130 Mg Caffeine
– Espresso Intenso : 115 Mg Caffeine
– Grande Mild : 106 Mg Caffeine
– Light Roast : 106 Mg Caffeine
– Medium Roast : 103 Mg Caffeine
– Café au Lait : 92 Mg Caffeine
– Lungo : 89 Mg Caffeine
– Espresso : 80 Mg Caffeine
– Lungo decaffeinato : 1 Mg Caffeine

Non-Coffee Drinks
– Chai Tea Latte : 34 Mg Caffeine
– Nestea Peach Iced Tea : 9 Mg Caffeine

The usual number that’s given as “safe” caffeine per day for adults is 400 Mg (eg. see “Caffeine: How much is too much?” from Mayo Clinic here). So this amounts to:

Mg caffeine per capsule Max capsules per day
Max. caffeine per day: 400
Specialty Coffee :
Cappuccino 107 4
Cappuccino Skinny 90 4
Latte Macchiato 85 5
Vanilla Latte Macchiato 83 5
Caramel Latte Macchiato 83 5
Latte Macchito Skinny 83 5
Mocha 45 9
Cappuccino Ice 35 11
Coffee Drinks :
Caffe Grande Intenso 130 3
Espresso Intenso 115 3
Grande Mild 106 4
Light Roast 106 4
Medium Roast 103 4
Café au Lait 92 4
Lungo 89 4
Espresso 80 5
Lungo decaffeinato 1 400
Non-Coffee Drinks
Chai Tea Latte 34 12
Nestea Peach Iced Tea 9 44

Spreadsheet is here if you want to play with the numbers (you can also comment on it). I’ve rounded to closest integer because nobody makes 3 cups of coffee and then decides to have another 0.8 😊

Enjoy !

cup-of-coffee.jpg

Post-truth, clearly illustrated

That’s a piece of news, tweeted by a random guy, that went viral. It’s false, but it didn’t matter at all.

 

Note that this is NOT a typical fake news case. The “guilty” guy -the one who tweeted the wrong info- actually did some effort to verify if his claim was true. Not that much; but this is totally understandable given that he had, like, 40 followers (basically his friends). And when his tweet went viral and was shared 100s of 1000s of times, he tried to find the truth. When he did, he admitted it, deleted the original tweet and posted the fact that it was false.

 

21fakenews-top-jumbo

 

It didn’t matter.

 

It immediately became, and still is, “proof” for a lot of people, asserting a fact that never happened.

 

I’m becoming increasingly desperate. There really doesn’t look any way out of this mess. People will believe anything if they want to believe it. And through the internet, it’s all too easy to find it. True or not; it doesn’t matter.

 

Good news: first conviction for spreading a hoax

This is really a big deal.

Yesterday (Mon 16-May-2016) a court in northern Greece convicted, for the first time, a journalist/blogger for spreading a hoax.

A hoax is a piece of fake and (usually) emotionally charged news item. The usual drivers behind this is “like farming” (earning a small amount of money for every ‘click’ via Google ads) and selling bogus “health” products on the side. It’s very common for hoaxes to go hand in hand with conspiracy theories, like “chemtrails” (“we are being spreyed with chemicals from airplanes!”) or, as in this case, “harmful vaccines” (“vaccines cause autism”, “pharma companies spread cancer through vaccines!”).

Until now, the economics were firmly on the side of the scammers propagating the hoaxes: there was only profit to make, no real cost and, more importantly, no risk. So they would (and are) spreading whatever b*****t they can think of, with no or fake proof but lots of emotional content (“cancer to children!!!”) and pocket the profits.

The hoax of this specific case was titled “Shock: See how companies are spreading cancer through a vaccine”. It was about a girl which is not named other than by first name who supposedly received the MMR vaccine and then died from a brain tumor.

The story is full of sh*t. It was very well researched here.

This conviction is the only one I’m aware of globally (I do hope there are more, but I haven’t heard of any). And it may be, however slowly, a turning of the tide. Organized society needs to fight against this, and such cases are long overdue.

More info here:
http://www.ekathimerini.com/208703/article/ekathimerini/news/court-convicts-hoax-journalist-for-reproducing-false-news

Ιδεοληψία

Μόλις διάβασα ένα άρθρο του BBC σχετικά με τον διάσημο κατάσκοπο-προδότη της Αγγλίας, τον Kim Philby. ​Είναι τρομακτικό να διαβάζεις πόση δύναμη έχει, και που μπορεί να οδηγήσει, η ιδεοληψία:

“[Kim Philby’s] KGB handler next instructs him to get the top job by removing his boss, Felix Cowgill.”

“It was a very dirty story – but after all our work does imply getting dirty hands from time to time but we do it for a cause that is not dirty in any way,” Philby explains.

“I have to admit that was the most blatant intrigue against a man I rather liked and I admired but the instructions stood and nothing I could do would alter them.”

Για όσους ξέρουν ποιός είναι ο Kim Philby ή έχουν διαβάσει έστω και ένα μυθιστόρημα του John le Carré, το άρθρο του BBC είναι must.

http://www.bbc.com/news/uk-35943428