6. A system, comprising: at least one computing device that implements one or more services, wherein the one or more services: obtain, in response to a request from a requestor, a challenge-response problem to include in response to the request, wherein the challenge-response problem to be humanly perceivable in a user interface, the challenge-response problem being based at least in part on psycholinguistics, evolutionary psychology, color psychology, or a combination thereof; determine, after transmitting the response to the request, if the challenge-response problem was correctly completed; verify that the response to the challenge-response problem indicates that the response was sent by an automated-agent, the verification based at least in part on a determination that the challenge-response problem was correctly completed; and perform one or more operations as a result of the response to the challenge-response problem being associated with the requestor being an automated-agent.
11. The system of claim 6 , wherein the one or more services are further configured to provide a second challenge-response problem after determining the challenge-response problem was successfully completed, wherein the second challenge-response problem includes exact logic as the challenge-response problem presented in a different manner.