What is the Surname of Barbie Doll?

Prove that twice of ten is the same as twice of eleven.

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

What makes this number unique: 8,549,176,320?

Can you count the number of lines in the below picture?

What is the last thing you take off before bed?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

A bomb exploded in a room full of married couples and no one died. How?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?