My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you find the company name in the pictogram below?

Take one out and scratch my head, I am now black but once was red. What am I?

What is the difference between a jeweller and a jailer?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

Who has married many women but was never married?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes