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

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

People put me on the table and cut me but do not eat me. What am I?

A man dies of old age on his 25 birthday. How is this possible?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

What kind of tree can you carry in your hand?

_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.