So we were told to keep our hands above our head and run out of the building.

CNN: Students describe panic and confusion after shooting

Cancers are driven to make copies of themselves, however, if cancerous cells run out of the building blocks of their DNA they develop "DNA replication stress".

BBC: Thriving cancer's 'chaos' explained

MicroStrategy, run out of a striking 17-story Philip Johnson building in the Virginia suburbs of Washington D.

FORBES: Database evangelist

The company is run by champion cyclist Igor Makarov from Turkmenistan, who operates out of a four-story building in Jacksonville, Fla.

FORBES: International