Can our believes manipulate physical reality?

Some extremes used in positive thinking. Take firewalking as an example. Explore yourself:

• http://www.show.co.za/KEN/ken.html
  • http://www.show.co.za/KEN/Firewalk.html
• http://www.firewalking.com/corporate.html
• http://www.e-skeptic.de/210699.HTM