And don't forget the progression of razors for the straight razor, to the Gillett Safety Razor, razors that used single-edge or double edge blades, to the disposable razors, and today razors with all types of disposable blades.  And then there are a variety of electric razors and even razor scooters.   It's no longer as simple as it was for Sweeney Todd: The Demon Barber of Fleet Street.    

Ouch! You nicked one of my pet peeves.  I don't want to bleed an essay on the subject, so I'll leave before I flood the room.

Shaving is not the only use of razors. Here are two razors everyone should be familiar with.

• Occam's Razor
• Hanlon's Razor

Best bookmark these two, kids. There's a test everyday called life.