What word begins and ends with an E, but has only one letter?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What is harder to catch the faster you run?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Can you find out the missing number in the grid?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?