This is Faber-Castell's 'Perfect Pencil' that's made out of 18 carat white gold. It costs about £8,000 so maybe isn't a good choice for chewing on during maths lessons.
It's not really a kebab though so don't actually eat it
This is just a regular pencil sharpener with a power drill attached. So lazy. (Quite cool though)
Is an Assyrian measuring rod that dates back to 2650 BC. That makes it a MASSIVE 4667 years old!
Rather than centimetres and inches, this measures things in Sumerian cubits. It might make a BOING noise when you twang it against a desk, but historians can't be sure.