Updated the descriptions for various people

data/astro.md

 # Astronomer 
 
+Want to get started using SWIFT? Check out the onboarding guide available
+[here](onboarding.pdf).
+
 ## Gravity
 
-+ Acuracy
-+ Method
+SWIFT uses the Fast Multipole Method to calculate gravitational forces between
+particles. As well as this self-gravity mode, we also make many useful external
+potentials available, such as a softened point mass and sine wave.
+
+Gravtiational accuracy can be tuned through use of a standard 'opening angle',
+which is controlled at runtime in the parameterfile.
 
 ## SPH Emulation Modes
 
-+ GADGET 2/3
-+ GIZMO
+There are many hydrodynamics schemes implemented in SWIFT, and SWIFT is designed
+such that it should be (relatively) simple for users to add their own. The three
+main modes are as follows:
 
-Some examples of the tests
+### GADGET-2 SPH
 
-## Paralleisation strategy
+SWIFT makes a 'backwards-compatible' GADGET-2 SPH mode, which uses a standard
+[Monaghan 1977](http://adsabs.harvard.edu/abs/1977MNRAS.181..375G) artificial
+viscosity scheme with a
+[Balsara](https://www.ideals.illinois.edu/handle/2142/23836) switch. Note that
+the GADGET-2 SPH scheme is implemented to be the same as in the public release
+of GADGET-2, rather than the equations as specified in the original paper, as
+there are some differences. This is to enable users to use SWIFT as a drop-in
+replacement for GADGET-2.
+
+### Pressure-Entropy SPH
+
+In SWIFT, the Pressure-Entropy and (in the future) Pressure-Energy schemes from
+[Hopkins 2013](http://adsabs.harvard.edu/abs/2013MNRAS.428.2840H) are made
+available for use. These schemes use a weighting factor of either entropy or
+energy in the calculation of density, which has the effect of promoting mixing
+and reducing spurious surface tensions that are present in a traditional
+"Density-Entropy" scheme (such as the GADGET-2 one presented above).
+
+### GIZMO (MFM)
 
-+ Brief overview of tasks
-+ Some scaling plots vs. GADGET
+Bert Vandenbrouke has also implemented a publicly-available GIZMO-like scheme
+([Hopkins 2015](http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1409.7395)
+in SWIFT. This promises higher-accuracy hydrodynamics, but with the natural
+adaptivity of SPH.
+
+There is a large amount of background reading material available in the
+theory directory provided with SWIFT. You will need pdflatex to build
+this documentation.
+
+SWIFT also provides a large library of hydrodynamical test cases for you to
+use, the results of which are available on our developer Wiki
+[here](https://gitlab.cosma.dur.ac.uk/swift/swiftsim/wikis/hydro-tests).
+
+
+## Paralleisation strategy
 
+SWIFT uses a hybrid OpenMP + MPI paralellisation scheme with the
+[QuickShed](https://gitlab.cosma.dur.ac.uk/swift/quicksched) tasking library.
+This enables SWIFT to achieve near-perfect weak scaling (see next section).
 

data/cs.md

 # Computer Scientist
 
-## CS I
+## Scaling
 
-Hello world.
+Cosmological simulations are typically very hard to scale to large numbers of
+cores, due to the fact that information is needed from each of the nodes to
+perform a given time-step. SWIFT uses smart domain decomposition, vectorisation,
+and asynchronous communication to provide a 36.7x speedup over our direct
+competition (the publicly available GADGET-2 code) and near-perfect weak
+scaling.
 
-Lorem ipsum dolor sit amet, consectetur adipiscing elit. In mollis erat quis augue scelerisque, eu maximus metus vehicula. Mauris nec ex blandit, lacinia urna a, viverra orci. Phasellus vitae mauris eget libero rutrum elementum. Etiam lobortis, ligula id ultricies egestas, ex nibh vulputate massa, sit amet dictum ante augue eget turpis. Aliquam in ipsum euismod nisl pulvinar imperdiet. Quisque purus ex, varius id pretium non, mollis accumsan sapien. Suspendisse nisl purus, finibus consectetur mattis eget, eleifend eget lectus. Nunc ut nibh consequat, malesuada dolor quis, tincidunt lectus. Vestibulum ornare in nisi vel volutpat. Nulla eget sapien non eros finibus ullamcorper. Duis ut erat diam. Nam sagittis lobortis nisl ut malesuada. In ac urna feugiat, sollicitudin risus nec, lobortis tellus.
+![SWIFT Scaling Plot](scalingplot.png)
+The left panel ("Weak Scaling") shows how the runtime of a problem changes when
+the number of threads is increased proportionally to the number of particles in
+the system (i.e. a fixed 'load per thread'). The right panel ("Strong Scaling")
+shows how the runtime changes for a fixed load as it is spread over more
+threads. The right panel shows the 36.7x speedup that SWIFT offers over
+GADGET-2.
 
-In pretium commodo nunc, nec condimentum libero cursus sit amet. Maecenas et auctor sapien. Maecenas vel lobortis neque. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Nulla pretium volutpat sapien, consectetur viverra nunc maximus quis. Nullam efficitur massa vitae leo fermentum, nec consequat risus ultrices. Nunc suscipit sem in libero vulputate, nec molestie nisl accumsan. Fusce congue magna nunc, vitae tincidunt purus suscipit vitae. Duis tempus, nibh nec consectetur commodo, mauris tellus interdum massa, in suscipit nisi libero et justo. Curabitur tellus metus, tempor sit amet dolor quis, pulvinar rutrum tellus.
-
-Cras tortor elit, scelerisque at quam eget, vestibulum maximus dolor. Nullam ultrices viverra tincidunt. Fusce ornare ex vel varius malesuada. Suspendisse eget ullamcorper enim. Morbi molestie ex nec dapibus interdum. Proin sit amet elit mi. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Curabitur a consectetur leo. Duis ipsum velit, pretium iaculis pulvinar vitae, iaculis id metus. Vestibulum sed consectetur eros, id pretium lectus. Morbi convallis condimentum molestie.
-
-Nam at tristique augue. Duis fermentum quam in mi aliquet congue. Morbi scelerisque dapibus libero eget pretium. Sed diam massa, elementum non hendrerit eget, vehicula sed metus. Aenean nec sem euismod, suscipit nunc mollis, auctor diam. Donec sed ante et augue suscipit volutpat in in nisi. Integer ut ante non libero ultrices sagittis at eu dui.
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