By Ashley Cronin
Chances are high that computer-science literacy will be increasingly relevant for jobs of the future. Some theorists even suggest that the ability to read and write code is a fundamental 21st-century competency. Yet, according to an August 2015 Gallup survey, many students get little exposure to these concepts at school; opportunities are even more limited for low-income students. To address these realities, there are a variety of free resources that can help teachers of all grades and subjects give students exposure to computer science, as well as access to opportunities that develop the skills required to approach coding problems.