Which alphabet is a part of our body?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Find the missing number in the sequence below:

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

Which word does the below Plexor means ?

How far can you walk into the woods?

In the given picture, in how many ways can you read the word "Tiger"?

Can you count the number of triangles in the given figure?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?