Color contrast checker based on the WCAG 2.0 standards. Enter hex codes for colors for foreground and background. Not quick for checking lots of colors, but based on the actual ratios in the standards.
Reflection on recent discussion about the value of 21st century skills in education, arguing that 21st century skills are more critical to success than much of the deep content knowledge currently expected in schools
Our problem is not that we can’t teach 21st century skills unless it is content specific, it is rather that we are content specific to begin with. When we compartmentalize our content in an effort to put it on a pedestal, we compartmentalize our learning of it, so that it has no relevance to the larger picture. 21st century skills, like the term or not, have that ability.