The US Food and Drug Administration (FDA) may take 55 years to release all the documents it used to declare Pfizer’s Covid-19 vaccine safe, a group of doctors and professors claim. The FDA approved Pfizer/BioNTech’s Covid-19 vaccine for people aged 16 and over in August, and, last month, extended its emergency-use authorization to children as young as five. This week, FDA regulators are expected...