The Association of the British Pharmaceutical Industry
Abpi: Heart and Circulation
A complete, self-paced lesson on the heart and circulation. Students work their way through illustrations and animated tutorials, and answer review questions along the way. There is a self-checking quiz at the end of the lesson.
NASA
Nasa: "The Slayton Case"
This site from NASA provides a description of the circumstances and events surrounding his grounding from space flight during the Mercury and Gemini Programs.
Akron Children's Hospital
Akron Children's Hospital: Kidshealth: Atrial Septal Defect
Atrial septal defect is a heart condition that can affect kids. Read more about it in this kid-friendly article.