The United States government has entered a shutdown after Republicans and Democrats failed to reach a budget deal, throwing public services and federal workers into uncertainty. The BBC reports that the deadlock over funding could disrupt government operations through October and beyond. Across the country, citizens may face inconveniences ranging from air travel delays to zoo closure cancellations. Around 750,000 federal workers -- nearly 40 percent of the workforce -- could be placed on unpaid leave, with many others required to continue working without pay. Essential staff, including border patrol, law enforcers, in-hospital medical workers and air-traffic controllers, are expected to continue working but without pay until the shutdown ends. Travellers could face long queues at airport security checks, while...