Blood is usually the first biofluid thought of when considering diagnostics, but the value of saliva as an alternative is increasingly being explored. Take our quiz to see how much you know about this growing field.
Test your knowledge of what's been happening in the scientific world over the past seven days.
Test your knowledge of what's been happening in the world of science this week.
Sep 19 - Sep 20, 2018
Nov 05 - Nov 07, 2018