Blood tests may give different results depending on when in the day, or the year, they are taken, which could result in people missing out on an anaemia diagnosis
Related stories
Survey finds social work needs clearer ethical guidance for AI use
Poor genetic health threatens many species—but it's fixable
Young people more likely to hold hostile attitudes toward women, study finds
Two eyeless shrimp-like species found in Japan's groundwater are new to science
Webb’s mysterious little red dots may be hiding entire galaxies
What is Ebola and why is the outbreak in DRC causing so much concern?