Pinhole cameras were one of the most sophisticated devices of the period, it made tasks much easier it basically worked exactly like the human eye and is something just like tracing.
I'm assuming that what you are saying is that while the headphone is plugged in to the computer, it still plays on the computer speakers.
Most likely, the headphone outlet is dirty and need cleaning. To solve this, plug in your headphones into the headphone outlet, and take it out really quickly. Do this for a certain amount of time until it works.
If this does not work, check the settings if you are allowing it to play into external devices or not.
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Plato users the answer is Social Interaction!
If you're talking about Microsoft PowerPoint, just go to the slide view, right click and click "Duplicate Slide".
I'm sure you can also Copy and Paste slides.
Answer:C.apple Osx
Answer C
