What is in seasons, seconds, centuries and minutes but not in decades, years or days?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Move three sticks of the spiral below to form a square.

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

O_er_t_o_

Complete the missing letters of the given word.

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

What is next number in the pattern below:

131 517 192 123 ?