Tests using advanced technology could resolve a longstanding puzzle over what is driving the accelerated expansion of the Universe. (sciencedaily.com)
«This addresses a longstanding puzzle why mixing two different sweeteners changes the aftertaste,» says Yuki Oka, a neuroscientist at Caltech in Pasadena. (sciencenews.org)
How aspirin works is a longstanding puzzle, but Harris and others theorize that it may help inhibit cancer by blocking cyclooxygenase - 2, or COX - 2, an enzyme commonly found in malignant tumors. (discovermagazine.com)