[caption id="attachment_59873" align="alignleft" width="225" caption="Epson's new PowerLite X9 offers 2,500 lumens of brightness and XGA resolution for $599."][/caption]

Washable headphones, a turnkey solution for delivering 3D video, and an iPad storage cart that can synch up to 30 devices to iTunes from a single USB connection were among the latest products from makers of school computer hardware, furniture, and AV systems to be displayed at recent ed-tech conferences.

3M demonstrated its PocketProjector MP180, a touch-screen handheld projection device that lets educators quickly access,...

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