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Physics and Mathematics


  1. Alternative theories

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

  • 2653 topics
  • 37149 replies
Physics Fiction In Crystall... - last post by exchemist

Astronomy and Space

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

  • 1206 topics
  • 23054 replies
Time Lapse Of The Stars - last post by Turtle

Engineering and Applied Science

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

  • 245 topics
  • 2446 replies
Is There Any Option For Me... - last post by Super Polymath