11.   Yet I can still detect the presence of a large lorry or bus out of the extreme corner of my eye.

12.   Among other things, microbial testing would be used to detect the presence of potentially deadly contaminants like salmonella and E. coli bacteria.

13.   As passengers approach, infra-red sensors detect their presence, activating tiny fans in the roof, which then force air through fragrance-soaked pads.

14.   BMW and Mercedes already offer sensors in some vehicles that detect the presence of a front passenger, telling the bag not to deploy if the seat is unoccupied.

15.   Biopure made a test available to detect the presence of its products in the blood in response to recent media reports and requests from IOC-accredited labs.

16.   A Belgian company has developed a test to detect the presence of a new strain of HIV.

17.   A German inventor has patented a device that uses electromagnetic signals to detect the presence of living bodies.

18.   A few days earlier, one of the divers reported finding nothing over an area where the magnetometer detected a strong presence of metal.

19.   A neutron spectrometer to detect the presence of water vapor coming from the asteroid.

20.   But scientists at Louisiana State University have come up with a way to detect their presence early on, before they cause too much structural damage.