Endianness
											big-endian
	Storing data in memory									Address		Contents
		32-bit word: 4 bytes.									1000	01
	Each byte has an individual address.										1001	23
		Smallest addressable unit									1002	45
	How many hexadecimal digits in each byte?										1003	67
		Hex digit = 4 bits, so a byte can hold 2 digits.									1004
	How do we store the value 01234567hex?										1005
	One way: store the digits in order,										1006
		starting with the lowest address.									1007
	This is called big-endian, because the biggest-value
		byte is stored first.