I have seen some interesting captchas over the years, and some of them intrigue me enough to find out why they are what they are - the history - the mythical meanings - all very interesting to me.

If you want to see all my other captcha research check out my master index http://bitbin.it/fbhOXm1W/

Here is another captcha word combo: field dynamics

Commercial & Industrial Business:
https://www.field-dynamics.co.uk/
http://greenfielddynamics.com/
http://www.pfedynamics.com/

Computing and Software:
https://blogs.msdn.microsoft.com/axinthefield/
http://www.fieldone.com/
http://www.microsoft.com/en-US/dynamics/crm-customer-center/create-or-edit-entity-fields.aspx
https://www.mig.com/microsoft-dynamics-sl/explore-microsoft-dynamics-sl/dynamics-sl-field-service-management/
http://www.pfedynamics.com/

Definition, Dictionary, and Pedia sites:
https://en.wikipedia.org/wiki/Electromagnetic_field
https://en.wikipedia.org/wiki/Quantum_field_theory

Education, Training:
http://www.fielddynamics.co.uk/index.html
http://www.fielddynamics.co.uk/how/process.html

Employment, Job Hunting:
http://www.fielddynamics.com/services.html
https://fielddynamics.wordpress.com/about/

Science and Research:
http://solidearth.jpl.nasa.gov/PAGES/mag01.html

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http://bitbin.it/fbhOXm1W/ Interesting Captchas master index - links to all my captcha pastes
http://bitbin.it/S4WFaJLS/ BitBin Throwback Index - interesting pastes I found here