The fascinating process of puzzle making

Encyclopædia Britannica, Inc.

Ilia Malinin is called the “Quadg0d” for a reason.

Media Editor: Casey Mendoza

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Overview of curling.

Encyclopædia Britannica, Inc.

To execute a jump serve, the server stands at the back of the serving area. As the server moves toward the service line, the ball is tossed in front of and above the server. As the server leaps, the forearm rises to shoulder height, and the striking hand is drawn back. At the peak of the jump, the striking arm swings quickly forward with the open hand making contact with the ball out in front of the body.

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Learn about Zeno's Achilles paradox.