In reaction, it was soon posited that abstract work had meaning, but as part of a code or system of signs.

ECONOMIST: 20th-century art

If your infant was born prematurely, has a heart or lung condition, or has a compromised immune system, watch closely for beginning signs of bronchiolitis.

CNN: Bronchiolitis

Unlike at the end of the first world war, there is now a global disease-surveillance system which would sound the alarm if H5N1 showed signs of being able to pass from person to person.

ECONOMIST: Averting a global plague | The

"We'll be keeping an eye out for signs of a repeat performance next year when the Earth-moon system passes through the same region of space, " Cooke said.

CNN: Bright explosion on moon visible from Earth, NASA says

Instead of sticking sensors onto the skin, Philips has developed a vital-signs camera system which the Dutch company says can measure heart and respiration rates extremely accurately.

ECONOMIST: Facial monitoring