I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Which country gets ill every time?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

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 5-letter word typed in all capital letters can be read the same upside down?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

What four weights can be used to balance from 1 to 30 pounds?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

You can hear me, but you can't touch or see me.

What am I?