An analysis of the songs of most of the world's passerine birds reveals that the frequency at which birds sing mostly depends on body size, but is also influenced by sexual selection. The new study ...

The effect of a lay health worker-led symptom assessment intervention for patients on patient-reported outcomes, healthcare use, and total costs. Middle third 1.15 (0.50) 1.11 (0.49) 1.04 (0.73) ...

Frequency of heatwaves and cumulative intensity has risen through the decades, research finds Heatwaves have increased in both length and frequency in nearly every part of the world since the 1950s, ...