Rearrange the letters in "new door" to make one word.

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

What has to be broken before you can use it?

Solve the equation in the image by looking at the pattern closely.

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

What work can one never finish?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

What is the longest word in the dictionary?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?