One of these submarines is shaped like a dolphin and can actually leap out of the water -- just like Flipper. The others dive deep, giving average (but very wealthy) people an incredible view of the sea.
You might not think about the physics involved in keeping your canoe afloat as you drift down a river, but this seemingly simple pastime is pretty complex. And is there a difference between canoeing and kayaking?
Personal watercraft such as jet skis are used by millions of Americans each year, but they weren't always that popular. Learn how personal watercraft came to be, how they work and the laws and environmental concerns that govern them.