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Summary of earlier suggestions, along with a new one: try USB Prober.
Researchers develop a "scent device" they hope may prove to be a reliable way to detect cancer in patients' urine before it becomes a serious problem.
Internal speakers are fine, USB speakers fail.
LED lamp hangs from your ear
Race for all-in-one handheld continues
Keyboard becomes unresponsive on various Apple portables (#2): Fixes
Almost too simple...
A series of workarounds, organized by increasing severity.
MacBook Special Report: Keyboard suddenly stops working
Keyboard becomes unresponsive on various Apple portables