Update README.md

README.md

@@ -23,12 +23,6 @@ The coil-coil topology relies on coils to generate all magnetic fields, not just
 
 **Links:**
 
-- [Tools page](http://cba.mit.edu/tools/display/?type=tool&id=zund_g3_l-2500_digital_cutter#)
-- [RWG Research coil plotting](https://www.youtube.com/watch?v=QfoMRPy4bJk)
 - [Planar magnetic headphones](https://www.innerfidelity.com/content/how-planar-magnetic-headphones-work)
 - [Ben Katz's Planar magnetic headphones pt. 1](http://build-its-inprogress.blogspot.com/2017/08/planar-magnetic-headphones-part-1.html)
 - [Ben Katz's Planar magnetic headphones pt. 2](http://build-its-inprogress.blogspot.com/2017/09/planar-magnetic-headphones-part-2.html)
-- [Laithwaite's magnetic river](https://youtu.be/OI_HFnNTfyU?t=875)
-- [MIT Hyperloop Report](http://web.mit.edu/mopg/www/papers/MITHyperloop_FinalReport_2017_public.pdf)
-- [Planar direct drive nanometer stage](http://iopscience.iop.org/article/10.1088/0957-0233/23/7/074011)
-- [PI Nanometer stage](https://www.physikinstrumente.com/en/technology/electromagnetic-drives/pimag-6d-magnetic-levitation/)