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

Spot 5 differences in two Christmas tree below:

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

What question can you never answer yes to?

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

Decode the movie name from the below picture?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Name a key which is hardest to turn.

Solve the mathematical equation in the picture below.

What does this rebus riddle means ?