Brain teaser

Smart break, open brainstorming, online quiz brain teaser.

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What can only be added, not reduced?

Why can Lao Zhang bite his eyes with his teeth?

Xiao Zhang broke something, but everyone applauded him! Why?

What fills a room so that people can move freely?

Which kind of flower in the world is usually cold in summer and warm in winter?

Why did he pick up a wallet on the street and not turn it in?

Without having a child or claiming an adopted child, he became a mother first. Who is this?

Xiao Li's family has never had a genetic disease. But why does Xiao Li have two hearts?

During the exam, Xiao Guang copied all Xiao Ming's. Why did Xiao Ming get 100 points while Xiao Guang got zero?

Never need to charge, but what is full?

How to cover a mirror with two coins?

Why does an elephant have only one right ear?