Pelli, for one, believes that they are going to come from human psychology and physiology--our willingness to ride elevators for extended periods and our ability to withstand pressure changes.

FORBES: World's Tallest Towers

After a while the "all clear" came, and hundreds of us stood in line for elevators to return to our rooms.

WSJ: Way Too Much God

When we discovered that the elevators were a long detour from our route, I wondered how Huang Xueqing, in her wheelchair, would get to see much of the museum.

NEWYORKER: The Grand Tour

He adds that Anybots had no control over our Wi-Fi coverage and that the robot isn't designed to go into elevators.

WSJ: My Life as a Telecommuting Robot