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Exploratorium staff physicist Paul Doherty explains the science behind this unpredictable pitch.

Pitcher Tom Candiotti demonstrates the mysterious knuckleball pitch.

Exploratorium staff physicist Paul Doherty explains how curveballs curve.

Pitcher Tom Candiotti discusses his knuckleball technique.

Pitcher Tom Candiotti discusses his knuckleball technique.

Exploratorium staff physicist Paul Doherty explains how atmospheric conditions can affect how a ball travels.

Hall of Famer Rickey Henderson describes hitting the "sweet spot."

Exploratorium staff physicist Paul Doherty explains what happens when you hit (or miss) the "sweet spot."

Hall of Famer Rickey Henderson talks about bat speed.

Rex Bradley, V.P. at the Hillerich & Bradsby Company (maker of the famous Louisville Slugger bat), talks about the history of bat design.