Science News for Kids Subscribe to an audio format Published by Week of Oct. 20, 2007; Vol. 172, No. 16 Better Than Pap: Blood test detects cervical cancer Blood tests for human papillomavirus (HPV) detect cervical cancer more reliably than traditional Papanicolaou smears. more... Axion Gone: New tests find no sign of anomalous particle New experiments contradict earlier claims of the discovery of the axion, a possible constituent of cosmic dark matter. mo ...