There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

How many words can a pen with half refill write?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

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?

What type of tree can I carry in my hand?

What is red and smells like blue paint?

Why is 6 afraid of 7?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?