The oldest known drawings are in the Chauvet Cave in France. This ancient site contains depictions of mammoths, bears, horses, lions, rhinoceroses and other animals that are more than 30,000 years old.
When a pencil and a sheet of paper aren't handy, Penultimate is an iPad app that lets you sketch, draw and write with a simple stroke of your index finger. Quickly jot a reminder in Penultimate to pick up the kids from soccer practice, and you'll see words take shape into a readable font unique to the application. Draw a map to give a friend directions to a specific destination, or write yourself a note to call your mother after dinner. If you're thinking about redecorating a room in your home, brainstorm while sketching a rough layout of the new arrangement before lifting any furniture. Choose between graph, lined and plain paper backgrounds, and if you make a mistake, you don't have to start over from scratch! Use the eraser function to delete as much -- or as little -- as you need, exactly as you would if you were using a pencil instead of your finger.