1)      Why is it better to have round manhole covers than square ones? This is logical rather than lateral, but it is good puzzle that can be solved by lateral thinking techniques.It is supposedly used by a very well-known software company as an interview question for prospective employees.
2)   I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

3)    What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?

4)  There was a green house. Inside the green house there was a white house. Inside the white house there was a red house. Inside the red house there were lots of babies. What is it?

5)  What is in seasons, seconds, centuries and minutes but not in decades, years or days?

6)     The more you have of it, the less you see. What is it?

7)     I give you a group of three. One is sitting down, and will never get up. The second eats as much as is given to him, yet is always hungry. The third goes away and never returns.

8)  Two in a corner,
1 in a room,
0 in a house, but 1 in a shelter. What am I? 

                                                                                                                                                     Answers are at bottom of the page

1)  A Square manhole cover can be turned and dropped down the diagonal of the manhole. A round manhole cannot be dropped down the manhole. So far safety and practicality, all manhole covers should be round.

2) The letter e. End, timE, spacE, Every place

3)   A river

4)  watermelon

5) the letter ‘n’

6) Darkness

7) Stove, fire, smoke

8) The letter 'r'.