Jake Sheridan writes: “As readers hurl claims of hidden bias towards outlets on all parts of the political spectrum, bias charts have emerged as a tool to reveal pernicious partiality. Charts that use transparent methodologies to score political bias—particularly the AllSides chart and another from news literacy company Ad Fontes Media—are increasing in popularity and spreading across the internet. But just because something is widely shared doesn’t mean it’s accurate. Are media bias charts reliable?”