«By contrast, the initial outbreak in Guinea remained undetected for several weeks, facilitating the spread of the virus to Sierra Leone and Liberia where the inability to track and contain infectious individuals compounded the situation and resulted in an uncontrolled epidemic.» (sciencedaily.com)
Lying prone on a rocky outcrop, determined to control your breathing and focus your mind so that you can concentrate on the task at hand whilst remaining undetected by enemy forces. (xboxoneuk.com)
The signal of the recoiling nucleus is incredibly subtle — like detecting the motion of a bowling ball when hit by a ping - pong ball — which is why the effect remained undetected until now. (sciencenews.org)