What has no start, end, or centre?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

What kind of storm is always in a rush?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

I have an eye but still cannot see.

Who am I?

Which Travels Faster? Solve below famous picture riddle:

What does below chemistry rebus means?