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
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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.
World Chocolate Wonderland, China's first theme park made entirely of chocolate has opened in Shanghai.
unfortunately alredy ended but here are some pictures of that tasty and wonderful Theme Park
Beans contain no cholesterol, and they can help lower your cholesterol level because they are one of the richest sources of fiber. in http://www.foodreference.com
I found this molds here, and I tried to do it, the result is above.
What we need:
scissors,
pen,
felt, I used red ad black,
double tape.
How to:
Print the draw you want to use to your mask. You can find a few at the end of this post, If you don't have a printer use tracing paper in your computer monitor;
With the pen draw the outside lines of the mask on the felt;
Cut the felt;
Cut of the mask eyes;
Repeat the steps 1-4 for the other mask elements (the black pieces on the pictures), use a different felt color;
Apply double tape n the back of the small mask ornaments, like in pictures;
Cut out the excess tape, use good scissors ;
Apply the small pieces on the mask;
Place the mask on your restless face and mark the holes to pass through the elastic;
Use the paper punch or the scissors to do a small hole;
Place the elastic; you may want to reinforce the hole with a small piece of felt.
Note:
You may apply glitter to give some light to your mask;
There are more bacterial cells in the body than human cells.
Scientists have estimated that about 95% of all the cells in the body are bacteria. The vast majority of these microbes can be found within the digetive tract. in about.com
Try this and watch the colors swirl in a milk bowl. This is very easy to do and takes less then a minute to do.
We need:
bowl,
food coloring, red and blue,
toothpicks,
detergent,
milk.
How to:
Pour a bit of milk on the bowl;
Add 2 drops of blue food coloring;
Now, away from the blue, add another 2 drops of red food coloring;
Let your restless play with the toothpicks and the milk on the bowl, let them "draw" at will, What happens?
Now, add a drop of detergent;
What happens?
The colors blend immediately, almost instantly, after we add the detergent
Why?
When we add the food coloring, it just stay there, exactly where we placed it.
Then, when we introduce the detergent to the equation, the colors blend in a sec. That’s because the detergent will make the surface tension to drop, and the "milk skin", that allows the color "to sit there", will disappear.
As we saw here, this skin works as a coat that maintains other molecules at surface, and therefore preventing its dissolution n the milk. When his surface tension is disturbed, the food coloring (and other milk molecules) find less resistance and therefore they can move all around in the bowl.
But there is another phenomena happening in the bowl: Some milk protein denaturate by the action of detergent.
Both things contribute for the surface tension changes.
DNA, or deoxyribonucleic acid, is the hereditary material in almost living "things".
Nearly every cell in a person’s body has the same DNA. Most of DNA is located in cell nucleus. We can say this DNA is like a stepladder and it can be as long as 1,80m but it can fold itself so tight it can be stored in a small space with micro dimensions.
Lets see how we can see this DNA without any microscopy help.
We need:
2 bowls, one of them must be transparent,
a knife,
a onion,
dish detergent,
salt,
water,
2 spoons,
alcohol.
How to:
Peel the onion;
Cut the onion, into small pieces, to the bowl;
Add some dish detergent, enough to cover it;
Add the salt (1/2 tablespoon);
Finally add the water (2 tablespoons);
Mix, careful, we don't want it to form bubbles;
Wait 20 min;
Mix again;
Separate the liquid layer from the rest, the DNA is on the liquid, reject the rest.
Add alcohol to the liquid, slowly, we want the alcohol to form a second layer above the liquid, try to make the alcohol run down the bowl wall.
Don't mix the layers;
Wait another 20 min.
What happens?
You can see small white strands; some of them may look like small clusters.
Why?
DNA precipitates when mixed with alcohol; this means it's not soluble in this reagent. This causes the DNA to clump together when there is a lot of it. And, usually, cells contain a lot of it!
NOTES:
Salt- Helps DNA to precipitate
Cold water- Helps to maintain DNA intact. If we use hot water cellular enzymes can destroy the DNA strand.
