UBER HAS hit a few potholes on its ten-year journey. In recent  years the ride-hailing company has been beset by sexual-harassment  scandals, lawsuits over drivers’ contracts and battles with regulators.  Its share price has fallen by a third since it went public in May. After  all these bumps, it is easy to forget just how much urbanites around  the world have come to rely on Uber, which is now on the streets of more  than 700 cities.
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