For marital happiness marry a coal miner, construction worker, oil platform engineer, farmer, etc.

FORBES: Readers Say

Loud applause and cries of joy erupted from construction workers assembled on a temporary work platform on the roof of the building as the huge, silver spire was gently lowered and secured into place.

WSJ: Spire permanently installed on WTC tower

There had also been indications of construction activity on the rocket site's upper gantry platform "required for future launches of long-range rockets", it said.

BBC: US institute: North Korea 'testing at rocket site'

As such, the Mass Transit Railway (MTR) added platform safety doors to all of its 84 stations, finishing the multi-year construction project in 2011.

BBC: Subway systems by the numbers

The open-cage printer will work using "fused filament fabrication" with 1.75mm filament, and will also feature 100 micron layer resolution (0.1 millimeter), rigid aluminum construction, an open-source software tool chain and optional heated build platform.

ENGADGET