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PyValem is a Python package, for parsing, representing and manipulating the formulas of *simple* chemical species, their states and reactions. Its source is available on GitHub under a GPL licence, and it can be installed from the Python Package Index, PyPI, using `pip`

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The Recamán sequence is a famous sequence invented by the Colombian mathematician, Bernardo Recamán Santos. It is defined by the following algorithm, starting at $a_0 = 0$:

*This blog post was inspired by Holly Krieger's video for Numberphile.*

Piphilology comprises the creation and use of mnemonic techniques to remember a span of digits of the mathematical constant $\pi$. One famous technique, attributed to the physicist James Jeans uses the number of letters in each word of the sentence:

The quadtree data structure is a convenient way to store the location of arbitrarily-distributed points in two-dimensional space. Quadtrees are often used in image processing and collision detection.