I have branches, but no fruit, trunk or leaves. What am I?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Which is heavier: a ton of bricks or a ton of feathers?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?

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

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?