In the first scientific experiment to be conducted via the social messaging service, experts will investigate "remote viewing" - the psychic ability to identify distant locations.
Members of the public will be asked to "tweet" their impressions of a randomly chosen spot in the UK visited by one of the researchers.
Then they will vote for which of five photographs on a website shows where the visitor was standing.
The trial will be repeated with visually different locations four times.
HT: Mark Shea