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* Livro do knuppi e do lorenzi
* Instituto plantarum
* [Como diferenciar serralha e dente-de-leão](http://www.matosdecomer.com.br/2016/08/como-diferenciar-serralha-e-dente-de.html).
+* [Cartilha Guia Prático de PANC Plantas Alimenticias Nao Convencionais](http://institutokairos.net/wp content/uploads/2017/08/Cartilha Guia Pr%C3%A1tico de PANC Plantas Alimenticias Nao Convencionais.pdf).
## Pesquisas futuras:
diff --git a/research/python.mdwn b/research/python.mdwn
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@@ -44,6 +44,36 @@ Python encourages polymorphism:
floating points sometimes can, in different ways—by using rational
representation and by limiting precision
+### Types
+
+ More formally, there are three major type (and operation) categories in Python
+ that have this generic nature:
+
+ Numbers (integer, floating-point, decimal, fraction, others)
+ Support addition, multiplication, etc.
+ Sequences (strings, lists, tuples)
+ Support indexing, slicing, concatenation, etc.
+ Mappings (dictionaries)
+ Support indexing by key, etc.
+
+ [...]
+
+ The major core types in Python break down as follows:
+
+ Immutables (numbers, strings, tuples, frozensets)
+ None of the object types in the immutable category support in-place changes,
+ though we can always run expressions to make new objects and assign their
+ results to variables as needed.
+
+ Mutables (lists, dictionaries, sets, bytearray)
+ Conversely, the mutable types can always be changed in place with operations
+ that do not create new objects. Although such objects can be copied, in-place
+ changes support direct modification.
+
## Libraries
* [SciPy.org — SciPy.org](https://www.scipy.org/) ([package](https://packages.debian.org/stable/python-scipy)).
+
+## Test projects
+
+* [Arduino Blog » How close are we to doomsday? A clock is calculating it in real time](https://blog.arduino.cc/2013/03/27/how-close-are-we-to-doomsday-clock/) ([python code](https://github.com/tomschofield/Neurotic-Armageddon-Indicator/blob/master/NAI_SERVER/nai_scraper.py) to parse [Timeline from the Bulletin of the Atomic Scientists](http://thebulletin.org/timeline)).