Nairobi is an essential hub for sub-Saharan passenger traffic, transporting 6.3 million passengers a year on more than 40 international airlines from Europe, the Middle East, Asia and the rest of Africa.
Another project suggested building contiguously between Tokyo and Osaka so that the two cities would become an uninterrupted megalopolis: the island of Japan imagined as a body and the new mega-city as its essential hub.
Many of the interacting proteins occupy essential hub positions in cellular protein networks, with key roles in chromatin organization, transcription, translation, maintenance of cell architecture and protein quality control.
Despite becoming an essential hub for music with over 200 million users and, according to the Wall Street Journal, a $700 million valuation, the Berlin-based company hasn't found a successful profit model yet.
Over the past decade, Colorado has established itself as an essential hub for electronic music, and even though Griz is from Detroit, he brings that funky Colorado sound in spades.
Him, the BBC and all of us, hopefully, and the micro bit's arrival is a fantastically forward step in guaranteeing that the UK remains an essential hub of the global games industry.
