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.
Washington, DC is in a league of its own when it comes to world-class museums, many of which are free to visit. Wander the halls of the Smithsonian Institution museums, explore cool off-the-Mall knowledge centers and discover groundbreaking exhibits and works of art right here in the nationâs capital.