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Could you [survive / survival] for a few days without your smartphone or without being [connected / connecting] to the Internet? How about living in a cave with no mod [cons / coins] for 40 days? Fifteen people did just [what / that] . They took part in a project called Deep Time to see how they would react to and cope with being [total / totally] disconnected from the modern world. Scientists from the Human Adaption Institute led the $1.9-million project. They wanted to understand how people would [adept / adapt] to drastic changes in living conditions. They put the volunteers [on / in] a cave for nearly six weeks. There was no sunlight and the cave dwellers had no [contact / contract] with the outside world. They had to [relay / rely] on their body [clock / watch] to know when to wake up, go to sleep and eat.

Most of the volunteers said they [employed / enjoyed] the experience of total isolation. Two-thirds expressed a desire to [remnant / remain] underground a while longer [in / on] order to finish projects they had started. Deep Time's director Christian Clot said the experience would, "test humans' ability [for / to] adapt to the loss of their frame [of / to] reference for time and space". He said: "Our future as humans on this planet will [revolve / evolve] . We must learn to better understand how our brains are capable of [funding / finding] new solutions, whatever the situation." One [striving / striking] observation is that participants lost their sense [on / of] time. Mr Clot said: "In our heads, we had walked into the cave 30 days ago". One team member estimated the time underground to [be / been] 23 days.

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