The predecessor of the toothbrush, the chew stick, first appeared in Egypt and Babylonia, and the earliest bristle toothbrush, the direct predecessor to the modern toothbrush, originated in China.he bristle toothbrush spread to Europe, brought back from China to Europe by travellers. It was adopted in Europe during the 17th century. The earliest identified use of the word toothbrush in English was in the autobiography of Anthony Wood, who wrote in 1690 that he had bought a toothbrush from J. Barret.
Usually, when you want to connect an external hard drive to your computer, you just plug it in and that's it. However, if you are using a Macbook Pro or any Mac computer, the hard drive must be pre-formatted as MAC OS Extended/ FAT32.
internal means inside something like a disk drive in a pc it is connected internally in the motherboard, external means outside of the pc such as an external hard drive, you connect this via the usb which is on the outside of the pc, hope this helps, Jack :) It's like a computer has a hard disk drive (HDD). Every computer has a internal HDD, which is inside of this computer box. Also you can buy a external HDD, which is in a case, it has to be plugged in electricity, and connected to your computer.