What famous saying does this rebus mean?

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

You see me once in June, twice in November, and not at all in May. What am I?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100