It's not uncommon for scientists to use Amazon's Mechanical Turk for research -- they can quickly gather survey data in return for a small outlay to participants. Academics are quickly discovering the limits of the task service with the modern bot-happy internet, however. Numerous psychology researchers have reported a sharp rise in the number of junk responses to their questions, many of which appear to come from bots. The offenders not only spam nonsensical answers to questions (such as "nice" or "good"), but tend to originate from the same location. And while anti-bot measures like captchas are in use, they aren't always reliable.