Simplify the following text for a Grade 4 native English-speaking person.
Original: Note : The DNA from a single ( diploid ) human cell if the 46 chromosomes were connected end-to-end and straightened , would have a length of ~ 2 m and a width of ~ 2.4 nanometers .
Simplified: Note : The DNA from a single human cell has a length of ~ 1.8 m ( but at a width of ~ 2.4 nanometers ) .