2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you count the number of squares in the given picture?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Can you count the number of triangles inside a triangle?

Why is a river so rich ?

In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
In House H1, The boy plays for Mexico Youth academy and the other child plays baseball.
In House H2, The boy Plays soccer for his school in Mexico and they recently have a newborn.

Can you prove that the probability of House-H1 having a girl child is more than that of House-H2?

Can you spot the hidden girl in the picture below?

I am white when I am dirty, and black when I am clean. What am I?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

Which English verb becomes past tense just by rearranging the letters?