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apple laptops really need a USB hub. USB hub makes your life easier!
yes
A usb hub refers to USB devices, just basically give you extra usb plugs. This is not related to a network hub.
A USB hub that runs on the power provided though the USB cable (rather than a USB hub powered by an external electrical supply).
Yes you can, but the USB 3.0 hub will only work at the speed of the USB 2.0 port.