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Physics and Mathematics


  1. Alternative theories

Formulae, ideas, theories, speed of light, black holes...

  • 2790 topics
  • 39141 replies
The Evolution Of The Friedm... - last post by Dubbelosix

Astronomy and Space

Space, Human spaceflight, space probes and the exploration of our Solar System. No personal theories or speculation please.

  • 1242 topics
  • 23620 replies
Superintelligent Extraterre... - last post by Super Polymath

Engineering and Applied Science

The art of applying science to specific problems. Materials, construction, technical issues and related topics.

  • 266 topics
  • 2562 replies
Boronizing - How Does It Work? - last post by exchemist