What famous saying does this rebus mean?

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You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

Using Only Five 5's and any mathematical operator make sum as 37

Why did Buffon take the goal with him after every Juventus match?

Can You Find The Naughty BUNNY Hidden In The Girl’s Bedroom Within 9 Seconds? Good Luck!

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Can you Find and name the hidden bird in the picture below ?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?