Privatise is transfer a business from public to private ownership and control.
Social insurance is a concept where the government intervenes in the insurance market to ensure that a group of individuals are insured or protected against the risk of any emergencies that lead to financial problems.
Great rivers change course over the seasons and the years, making it difficult to determine which measurement comprises its accurate length. As the crow flies, it is about 2,400 miles from the Nile's source to its outlet (the meandering Amazon covers a mere 1,100 miles of straight-line distance)
The present is a time frame that is usually happening at the moment. For example, 1850 is the past, 2017 is the present, and 2037 is the future.