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Singularity - Sleator, William
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Sixteen-year-old twins Harry and Barry stumble across a gateway to another universe, where a distortion in time and space causes a dramatic change in their competitive relationship.

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Singularity 1995, Puffin Books, New York, NY

ISBN-13: 9780140375985

Trade paperback

Singularity 1995, Turtleback Books, New York, NY

ISBN-13: 9780808575238

Turtleback School & Library edition

Hardcover

Singularity 1986, Starfire, Toronto, Canada

ISBN-13: 9780553256277

Mass-market paperback

Singularity 1985, Dutton Books, New York, NY

ISBN-13: 9780525441618

Trade paperback