martes, 14 de diciembre de 2010


Memorizing formulas is not the best way to learn Physics; to understand and deduct them is a lot better way to understand them and then learn this science and all the sciences, so when you explain these formulas to somebody else who does not know a thing and he or she understands them, then they are there, engraved somewhere in your brain, and you start multiplying the learning effect.
Think of this: What is the formula of velocity? if you try to remember it  from your Physics Lessons in high-school you do not have many chances to remember it. You may end remembering your sweetheart  from those times.
As an example of what you may have had in your text book, here is the definition of velocity from Wikipedia (if you get confused or tired jump to the next paragraph):

In physicsvelocity is the measurement of the rate and direction of change in position of an object. It is a vector physical quantity; both magnitude and direction are required to define it. The scalar absolute value (magnitude) of velocity is speed, a quantity that is measured in meters per second (m/s or ms−1) when using the SI (metric) system.
For example, "5 meters per second" is a scalar and not a vector, whereas "5 meters per second east" is a vector. The average velocity v of an object moving through a displacement ( \Delta \mathbf{x}) during a time interval (Δt) is described by the formula:
\mathbf{\bar{v}} = \frac{\Delta \mathbf{x}}{\Delta t}.
To understand it try to deduct it, and then try to explain to someone for the first time – as  I will in a moment – what is the meaning of velocity in the simplest way and then built from it.
Here I go: Velocity tells you how much distance you travel in a period of time, for instance if you travel 2 Km (I am Mexican) in 1 hour, then your velocity is 2Km per hour, how many kilometers will you travel in 2 hours? it sounds so easy that even I understood it. I am sure you can do better than me;  this is the power you have for learning and teaching, which is engraving in your brain the reasoning of the formula.
From here; what would happen if second graders teach first graders what they’ve learned a week ago and they are graded according to the result of the tests of their new pupils.

Social networks spread in similar way to viruses

You can use this article to understand either:

Human Networking Theory Gives Picture of Infectious Disease Spread
Mon, 13 Dec 2010 15:39:00 -0600

Photo of a woman blowing her nose into tissue.
It's colds and flu season, and as any parent knows, colds and flu spread like wildfire, especially through schools.
New research using human-networking theory may give a clearer picture of just how, exactly, infectious diseases such as the common cold, influenza, whooping cough and SARS can spread through a closed group of people, and even through populations at large.
With the help of 788 volunteers at a high school, Marcel Salathé, a biologist at Penn State University, ... 
More at

lunes, 6 de diciembre de 2010


No, just some that can surprise even the most visionary scientist, if this happens in our small, very small earth, What type of life can we find around the corner?
Iron Lisa; my most sincere congrats,