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

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

What happened when the wheel was invented?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

What can you hold in your right hand, but never in your left hand?

Why Aeroplane windows are round?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?