Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

A very interesting trivia question for all.

Why do men's shirts have their buttons on the right side and women's have buttons on the left-hand side?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

What can you serve, but never eat?

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

What is it?

What is the word or phrase?

I look at you, you look at me I raise my right, you raise your left. What am I?

Replace the question mark in the picture below.