PCA step by step

I have found the great step by step Python tutorial to PCA:

http://sebastianraschka.com/Articles/2014_pca_step_by_step.html

Alison Gopnik TED talk and Bayesian babies

Alison Gopnik's TED talk about babies and what they are thinking about is simply awesome.
https://www.ted.com/talks/alison_gopnik_what_do_babies_think?language=cs#t-533681

Her presentation is clear and you won't be bored. It is also closely connected to my talk in the Neuroinformatics course. She pointed out that the length of the childhood is critical for the evolution of higher cognitive functions and smart behavior. Crowns who are very clever birds that can use sticks like a tool to get a food are dependent on their mother for nearly two years compared to chickens whose childhood last only for few months.

Language development and disorderds - chart

I have found this very interesting chart on the blog: http://eceiler.blogspot.cz/2013/02/week-4-language-development-and-literacy.html?view=timeslide 

This chart is from the book by Kuder:  Teaching Students with Language and Communication Disabilities