Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Different lights make me strange by changing me into different sizes. What am I?

Complete the table series riddle by finding the number that can replace "??".