How long should politicians serve in office?

Senators Mitch McConnell and Dianne Feinstein, two of the oldest members of their parties, both recently appeared to suffer health episodes while on the job. So, how long is too long in office?

A.I. brain implant helps paralyzed man move, feel again

“There was a time that I didn’t know if I was even going to live, or if I wanted to, frankly. And now, I can feel the touch of someone holding my hand. It’s overwhelming," said Keith Thomas, the patient who received the revolutionary treatment.