The normal, or resting, pulse rate in adolescence can range between 50 to 60 beats per minute to as high as 90 to 100. When active, the maximum heart rate for a teen â the highest amount his heart can safely beat per minute â is about 200 to 205. You can obtain the exact number by subtracting your teenâs age from 220.
About. 1  Smithsonian Earth is a commercial-free streaming service that offers unlimited access to original documentaries, short series, and Nature Scenes. Shot in stunning 4K Ultra HD resolution by filmmakers around the world, its programs will bring you closer than ever before to nature's most fascinating animals and wildest locations.
The Smithsonian Museums in Washington, DC are world class attractions with a variety of exhibits ranging from a 3.5 billion-year-old fossil to the Apollo lunar landing module. Visitors enjoy examining more than 137 million objects, including many irreplaceable historic artifacts, works of art, scientific specimens and cultural exhibits. Admission to all of the Smithsonian museums is free. With 19 museums and galleries, there truly is something for everyone.