Hi Dear, An MRI is a series of detailed picture of your brain, as they were at the time the MRI was done. They are valid as long as no other changes occur. Basically, if somebody has an MRI today that is normal, and have a stroke or hernia tomorrow, obviously the result will change (You never know).
Undo an action. Press Ctrl+Z or click (Undo) in the ribbon until you've fixed your mistake. You can't undo some actions, such as clicking commands on the File tab or saving a file. If you can't undo an action, the Undo command is dimmed.
The default prompt on the bash shell, which is the default shell on Linux, contains the name of the user, the name of the computer and the name of the current directory (i.e., the directory in which the user is currently working). command is an instruction to tell a computer to do something, e.g., to execute a program. The functions of a command prompt are (1) to inform the user that the system is ready for the next command, data element or other input and (2) to help the user plan and execute subsequent operations.