CURRENT SCIENCE Optricks.

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CURRENT SCIENCE Optricks

MYSTERY PHOTOS

BEND YOUR MIND

• Where does a fifth dot belong?

WHATIZIT?

This is the Ptolemaic system, formulated almost 2,000 years ago by Claudius Ptolemaeus, a Greek astronomer and geographer. His model was accepted until Nicolaus Copernicus challenged it the 16th century. What did Copernicus object to?

Mystery Photos: Top: Photo Researchers;

Middle: Alex Antonow, Morton Grove, III,; Bottom: Photo

Researchers; Whatizit: Shigemi Numazawa/Photo Researchers

PHOTO (COLOR)

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