Some university out there was working on one and they can hear voices through the time machine when it's turned on
The thing is though you can only go back to the day the time machine was turned on. So if you turn it on today, and leave it on for 5 years, you can only go back to today. You can't turn it on today and go back to the 1980's
& this is hypothetically speaking of course because time travel hasn't been done
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