The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

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.

Which city is three-fifths chick two third cat and 50% goat?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

What breaks yet never falls, and what falls yet never breaks?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Why do people go to bed?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

Can you count the number of squares in the figure below?