• Jibo would never have let this happen: the crowdfunding campaign for the robotic family assistant is found on Indiegogo, not Kickstarter (19 July, p 21).
• Dial M for muddle: the fields referred to by the acronym STEM are science, technology, engineering and maths, not medicine (12 July, p 26).
• We got our numbers confused when discussing Alzheimer’s: the etanercept trial had 18 patients in the treatment group and 15 in the control (19 July, p 10).
