TED Community » Marcos Vinícius Petri

More About Me

I'm passionate about

Science, Astronomy, Chemistry, Music, movies, learn something new.

An idea worth spreading

Free access to information, culture and knowledge. What is made by humans should be spread through humans.

Talk to me about

I'm in love with Nature. I want to know how does it works and see the beauty of the place that I'm part of.

People don't know that I'm good at

Saying the periodic table of elements in order.

Comments

• TEDCred score: +73.10 TEDCred reflects your contribution to the TED community.

• A comment on Talk: Sonaar Luthra: Meet the Water Canary

  Jan 18 2012: What kind of test does it take? If it shows red light, the water is contaminated with what? Especially, if it gets green, the water is not contaminated with what? I mean, you can't test for all contaminations in a single eletronic device. You can get a false sensation of safety because the charts tells that your region has clean water, but it can be contaminated with an unseen bacteria.
• +3

  A comment on Talk: Martin Hanczyc: The line between life and not-life

  Nov 15 2011: Me and my bad English will try to explain what happen in the chemical level:
  When he show that red blob swiming around, accordingly to himself, the blob was made out of an oil called nitrobenzene oil, filled (like a solution, with the solvent being the oil) with an acid anhydride (anhydrides became acid in water). The transparent liquid is an alkaline aqueous solution. In such solutions the nitrobenzene oil has some surface tention. In acidic solution, the surface tention tends to became less influent and the liquid flows more easily, but it remains as a blob more or less. So what happens is: The red 'cell' is a bubble of oil filled with some compound. When the compound touches the water, it became acid. When that happen the nitrobenzene oil loses some of it surface tention and the bubble tends to flow in that direction. The bubble now touches the alkaline solution again, but more acid is being made and the blob will move until the fuel exist. Ceasing the fuel, no energy can make the cell to move, because you must have this difference in pH of the water. If the pH is acid, the cell will stop moving because no difference in the surface tention would be present. It would flow more easily, but would not go anywere now.
  He showed that, with a big range of small chemicals, you can make a system that will show lifelike behaviors, right? And he also presented us that some clay can be chemically active (i.e it can act as a catalyst, promoting reactions that would not occur normally).
  These clays would make randomly reactions. Some of then could break water bonds and produce hydrogen and oxygen, some of then could join two different molecules, and some of then could turn the acid back to the anhydride (what wouldn't happen normally).
  So, imagine this system: A red blob that uses the acid anhydride that has little pieces of that clay in it. If there is some way to remove the acid so that would be used again, the difference of pH is now dinamically controled by the cell.
• +2

  A comment on Talk: Derek Sivers: Keep your goals to yourself

  Jul 2 2011: This is true for me. All of my goals that I've said before starting it, did not get 100% done. The goals that i'm ashamed to tell everyone (exercise, etc.) i can do everyday without problems.

• A comment on Talk: Eli Pariser: Beware online "filter bubbles"

  May 3 2011: Great talk. I saw this on Facebook, but it has an option to show every update. Maybe Google can take the example and add in the seetings one option like this. "Show all content" that shows the same result to everyone.
  They can make these algorithms. Sometimes they're convenient but it's nice if you have the control of what information you get.
• +5

  A comment on Talk: Salman Khan: Let's use video to reinvent education

  Mar 9 2011: Khan is one of the best person in the world.
  I hope his idea can spread everywhere. Can you imagine if this method become popular?
  Not just teaching math, chemistry, history but music, cooking... the list can go on and on!

• A comment on Talk: Andrea Ghez: The hunt for a supermassive black hole

  Jan 8 2011: Yet this is a little difficult to me to understand and my bad English isn't gonna help. But i'll try to explain:
  
  If you have 2 objects with the same size, separated by a certain distance distance, the two objects will orbit the center of mass hence the middle point (since they have the same mass). It's equivalent a object in the middle point with mass 2x the mass of one of then.
  The two objects don't need to orbit a object in the middle.
  
  If a 3rd object (with insignificant mass) orbit that center, it don't need orbit a centered object neither.
  So, what is the difference from the center of mass of the Galaxy from a supermassive black hole?
  What can show that those stars with 15 years orbit isn't orbiting the galaxy's center of mass?

• A comment on Talk: Sugata Mitra: The child-driven education

  Oct 17 2010: How can we handle the wrong information they get on internet? I loved the ideia, I trully believe in self learning (because it works so well for me) and the Talk made me want to put a computer in every corner for the kids. The bad thing is that if you don't guide the children, they might go to wrong places and they'll learn stuff that isn't quite accurrate. I use internet for a while, so I know how to filter this type of information, but what happens if you ask some group about astronomy and, two months later, what they'll tell you is that who is libra are more able to comunicate than virgos, or that the man didn't landed on the moon?
  I know the internet is a great place to learn. The information is there, and it's easier to find them instead of write again in a way children can understand. But you have to be able to knows what is good information and what isn't

• A reply on Talk: Deborah Gordon: The emergent genius of ant colonies

  Oct 9 2010: Thank you. I didn't know about that, it's very interesting

• A comment on Talk: Deborah Gordon: The emergent genius of ant colonies

  Sep 18 2010: Does anyone knows why these ants are doing this? http://www.youtube.com/watch?v=KHnkb-Lx1_s

• A comment on Talk: Allison Hunt gets (a new) hip

  Jan 2 2010: I didn't want be rude, but I think I'll be. I really understand that you was in pain and this is awful. It's beautiful your happiness. Still, your arguments made me uncomfortable. I don't think this is an idea to spread because isn't for everyone. I don't live in a developed country. A big part of population here can't affort the paid hospitals. And the public health care is inefficient. You can find people waiting 7 years to get a transplant, but you don't see they trying to manipulate, trying wrong ways just to get in front off someone who wants to be fixed as well.
  
  EDIT: I posted this comment after i saw the talk. Then I read all the comments below and I realized this isn't a talk with an intention to despise others. I didn't focused to her volunteering. Nevertheless I'll not delete my comment, because is a lot of wrong things about public health care around the world that i can't forget.