Hello. Have you ever been out on the water in a kayak?
I believe so. Are they different from canoes?
Yes the difference is the paddle, kayaks have a double-bladed paddle. Both are a lot of fun. 
Is it dangerous?
, to capsize and right it without it filling with water or ejecting the paddler.
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Some modern boats vary considerably from a traditional design but still claim the title "kayak", for instance in eliminating the cockpit by seating the paddler on top of the boat ("sit-on-top" kayaks); having inflated air chambers surrounding the boat; replacing the single hull by twin hulls, and replacing paddles with other human-powered propulsion methods, such as foot-powered rotational propellers and "flippers
-blade paddle, or in kayaks (K), a closed canoe with a double-bladed paddle. Each canoe or kayak can hold one person (1), two people (2), or four people (4). For each of the specific canoes or kayaks, such as a K-1 (kayak single), the competition distances can be , , or long. When a competition is listed as a C-2 500 m event as an example, it means two people are in a canoe competing at a