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Understanding the amazing complexity of sign language
Most people are familiar with sign language, the system that deaf people use to communicate. What fe...
International PISA tests show how evidence
The Programme for International Student Assessment (PISA) implemented by the OECD has been controver...
How to fix Latin America’s homicide problem
In the 1990s, the capital of Colombia’s mountainous Antioquia province Medellin had one of the world...