confines of the transporter beam while being transported, although this is rarely shown. Persons being transported are at least sometimes able to perceive the functioning of the transporter while they are in transit. In the TOS episode "The Doomsday Machine", the Enterprise transporter malfunctions while transporting Scotty from the disabled USS Constellation to the Enterprise due to a power drain, and Scotty's pattern is nearly lost in transit. As soon as he successfully materializes, Scotty asks the transporter operator with concern, "What's the matter with that thing?" and orders the transporter to be taken offline for emergency repair. Some species do not use transporter technology for a variety of reasons. In the first appearance of Trill in the TNG episode "The Host", Trill were unable to be transported, once joined with a symbiont. It seems that was due to the symbiont being detected and removed by the transporter technology as an infestation in the host. Odan, the Trill host in this episode, is reluctant to say why he will not travel this way, and it only becomes apparent that he is carrying a symbiont when he is later injured. All the crew of the Enterprise react as if they have had no contact with this species before. It later becomes apparent that joined Trill have been working in the Federation for some time. In season three of Star Trek: Discovery, set in the 32nd century, personal transporters are used. "Beam me up, Scotty" The famous catchphrase "Beam me up, Scotty" refers to the use of the transporter device to recall a crewmember to the ship; the device was often operated by chief engineer Montgomery Scott during The Original Series. However, it is a slight misquote that was never uttered verbatim on the show. The closest actual phrase, "Scotty, beam me up", was spoken by Admiral Kirk in Star Trek IV: The Voyage Home (1986). On the special edition DVD of Star Trek IV, the text commentary provided by Michael and Denise Okuda (co-authors of The Star Trek Encyclopedia (1994) and The Star Trek Chronology: The History of the Future) indicates that this was the closest anyone came to using that catchphrase in an official Star Trek production. Real-world feasibility In August 2008, physicist Michio Kaku predicted in Discovery Channel Magazine that a teleportation device similar to those in Star Trek would be invented within 100 years. Physics students at University