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Some of our visitors have sent emails with interesting questions, we decided to start having a space to answer them. In this space the blog "Restless Minds" will answer all questions you send us
Send us your question for the email: Restless Minds.

Science progress affects our daily life and "to know" means you are going to chose right, because it allows you to form your own opinion on scientific everyday issues. On the other hand, having an elegant and harmonious vision of the world where we live in leads to a feeling of intellectual satisfaction.
We believe this kind of scientific day to day knowledge should be encouraged from an early age, and that's why this project was born: science, culture, knowledge, crafts for your restless mind.

Friday, April 13, 2012

Cool Yogurts- Super Restless Mind

Marta Bolt in her blog "Caminhando juntos", shared with us a super restless idea: colorful yogurt. This yogurts  are really cool and easy to do, you just need a yogurt machine, and some smarties.

What we need:
  • smarties, or other similar chocolate,
  • usual ingredients to do normal yogurt (milk, natural yogurt... sugar),
  • yogurt machine.
How to:
  1. Preare the yogurt mix like usual;
  2. Choose your favorite smaties color;
  3. Add a few smarties, of that color, to your yogurt mix, before you turn the machine on;
  4. Turn on the machine normally and wait.
Marta says this is what it takes to get a cool and colorful yogurt
Et voilá!
multicolored yogurts!


Instant facts- Just add water 77

Black coffee with no sugar contains no calories.

Thursday, April 12, 2012

Instant facts- Just add water 76

Catherine de Medici (1519-1589) is said to have taken the Italian peas "piselli novelli" to France (along with her chefs) when she married Henri II in 1533. This helped make petits pois a delicacy in France.

Wednesday, April 11, 2012

Instant facts- Just add water 75

The world record for eating peas is held by Janet Harris of Sussex who, in 1984, ate 7175 peas one by one in 60 minutes using chopsticks!

Tuesday, April 10, 2012

I believe I can fly by St. Dominic's Chorus

Just wonderful

Check it out, t's really Restless and beautiful: I believe I can fly- St. Dominic's Chorus

Et Voilá!
The kids love the rhythm and the soul!

Measuring time with a candle

Clock: Any instrument for measuring time intervals.
Dicionários Porto Editora

The clock is one of the earliest inventions of mankind. The first instruments used to measure time were based on solar motion and daylight. These mechanisms had a huge problem; in order to work the sun has to be visible.

Because of this fact it soon becomes obvious that it was necessary to find other methods "to read" the time, methods that were not dependent on weather conditions. Soon people find other mechanisms to track the time such as the hourglass, in which a small amount of sand is placed in a container which has a small hole in the base witch allows the sand to a second container, by changing the amount of sand and / or the hole size is possible to change the velocity of the sand, this mechanism is still used in some community games, it is effective and visually pleasing.

Water clock

Another mechanism is the water clock. This clock like an hourglass consists of two containers, initially empty, the containers and placed one above the other. The top container has a hole in the base; the other one has a scale. We fill up the top container that will "pouring water" to the second container.

Today we use clocks with milimetric precision, and we have atomic clocks that set universal time. The website, states that until 1986 the Greenwich Mean Time or GMT was used as the world standard but was replaced by the Coordinated Universal Time ou UTC, which is based on atomic standards
Sun clock- Lisbon Cathedral walls

UTC is the world standard accepted by "International Bureau of Weights and Measures".
0.00 UTC still means 0.00 in the GMT standard.

Today we are going to build a candle clock.
It's simple to understand and easy to work with.

What we need: 
  • 2 candles, similar,
  • string,
  • black marker,
  • 2 candle holders,
  • 1 dish,
  • a few bolts,
  • Hourglass
  • clock.
How to:
  1. Make sure the candles are similar, size and thickness;
  2. Place both the candles on the candle holders;
  3. Light the first candle;
  4. Count 10 min, you can set an alarm;
  5. When the alarm goes off make a mark with the pen in the second candle, marking the high of the first candle after 10 min;
  6. Repeat the step 4 and until the first candle runs out.
  7. At the end you should have a candle like the one in the picture;
  8. Tie the bolts to the candle, one in each pen mark;
  9. Place the candle+ candle holder in the dish;
  10. Light the candle.
Marked Candle
What happened?
Every10 minutes a bolt will fall in the dish, working as an alarm.

The first candle works like a standard, we used it to know the rate of burning of the second candle, that’s why it's important both candles are similar.
Of course this clock is completely inaccurate, but it’s a good start. We can read in many candle tags its estimated life time, this is always only a reference, in fact a candle duration is related with many factors.
Another thing we must have in mind is that the "marks" on the second candle were made without using a measuring instrument.

If you want to go further:
Industrially marked candle
  • Use the ruler to mark 1/2 inch segments on the candle, light it and measure the time it takes to get there. Answer the question: All segments take the same time to burn? Why?
  • Get similar candles in different colors. Do they all burn at same rate?
  • Get similar candles, all at same color but with different brands. Do they all burn at the same rate?
  • Get similar candles, all at same color and brand but with different wax. Do they all burn at the same rate?
  • Use at least 3 candles of each to get more accurate results. You will take the average at the end;
  • Change one, and only one variable at time, otherwise you will not be able to get a real cause/effect;
  • Take note of all results and observations in your notebook

Warning: The candle is hot, caution! Do not move the candles while the experiment is going. 

References:;;; Mandell, Muriel, 1998, "Experiências Simples sobre o tempo com materiais Disponíveis" Bertrand Editora

Et voilá!
You will never let the time fly again.


Friday, April 6, 2012

Instant facts- Just add water 74

That famous red phone that’s depicted in many movies isn’t actually in the Oval Office. It’s in the Pentagon.

Thursday, April 5, 2012

Instant facts- Just add water 73

Lobsters are ten-legged crustacean.

Wednesday, April 4, 2012

DIY Cat bell Tambourine- Music for everyone

We alredy did some music here, with the rice shaker. Today we are going to add another instrument to our orchestra, the cat bell tambourine.

This project is easy and it can be very colorful.

What we need:
  • Paper punch,
  • 2 disposable plastic plates, you can use paper ones, if you prefer,
  • Cat bells,
  • Glue, the type depends on you use paper or plastic plates,
  • Ribbon, string works well
  • Large neddle, large enough to the string/ribbon you want to use,
  • Paints and brushes,
  • Varnish.
How to:
  1. Paint the plates, as you wish, eat side down;
  2. Let them dry, 3 hours is more then enough;
  3. Varnish;
  4. Let it dry again;
  5. Glue the plates together, with painted side out;
  6. With the paper punch, punch several holes all around the plate circumference;
  7. Get the ribbon and the cat bells and tie them thru the holes.
You are ready!

Et voilá!
Now you just need to do some music!


Instant facts- Just add water 72

Sheep were domesticated by humans around 10,000 BC.
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