The new safety level is about 100 times higher than the background level of dust at ground level.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The

Measurements in the town on Monday showed levels of the dust in the air were three times the maximum safety level.

BBC: Villagers despair in Hungary's red wasteland

That approach has allowed them a level of mobility that leaves other robots in the dust.

FORBES: Meet Cheetah, Boston Dynamics' Terrifyingly Fast Running Robot (Video)

"Apparently, those did not show any elevated level of concern, especially for asbestos, in the dust, " he said of the Brooklyn samples.

CNN: CDC, EPA: Little risk to public from sites

In 1994, as the Mandela government came to power, Motsepe left the law firm and struck out on his own, hoping to build a business contracting low-level labor like sweeping, where workers use brooms to glean gold dust from the rock surface after industrial mining crews have done their work.

FORBES: On The Cover/Top Stories