A rapid systematic review of attention-deficit/hyperactivity disorder (ADHD) and high order writing: Current findings and implications for intervention.

Background: Theoretical writing models and empirical studies have suggested a possible strong association between attention-deficit/hyperactivity disorder (ADHD) and high order writing (e.g., planning, text production, and revising).

Hovering performance of Anna's hummingbirds (Calypte anna) in ground effect.

Aerodynamic performance and energetic savings for flight in ground effect are theoretically maximized during hovering, but have never been directly measured for flying animals. We evaluated flight kinematics, metabolic rates and induced flow velocities for Anna's hummingbirds hovering at heights (relative to wing length R = 5.5 cm) of 0.

That darn scapula: a common pitfall in interpreting the chest radiograph.

For the inexperienced interpreter of chest radiographs, the normal scapula can mimic some very common and potentially serious abnormalities. Failure to recognize this normal bony structure can lead to needless diagnostic work up and treatment. The potentially mimicked abnormalities fall into 3 major categories: lung parenchymal abnormalities, pleural abnormalities, and bone abnormalities.