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.
Plan Your Visit. Smithsonian Gardens are located around museums throughout the National Mall in Washington, DC. They are open year-round, seven days a week, with something to see in every season! The Enid A. Haupt Garden is the only gated garden and opens daily from dawn to dusk. A walk around all of the gardens, at a leisurely pace, takes about 3 hours.