To overcome the learning losses, the NWEA suggests that an additional 4.5 months of math and 4.1 months of reading instruction would be required for students.
In the aftermath of violent riots and looting in France, the country's former intelligence chief, Pierre Brochand, has blamed the disorder on the mass immigration policies of the last 50 years.
The tests, which took place over 12 weeks with some of the world's leading banks, including Citigroup Inc. and Wells Fargo & Co., sought to evaluate the potential of digital currencies to enhance both domestic and international payment systems.