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- a not necessary
- Part of the problem, the authors say, is that patients are being prescribed multiple, unneeded CT scans, a predicament that could be avoided with better communication between .
- If potential parents decide against having more children, scientists working with stem cells might ask them to consider donating the unneeded embryos to research.
- When the engine is running at light loads, it's logical to shut down unneeded cylinders to save fuel, like turning off lights in unused rooms.