The invention of the American designer Lauren McCarthy, who invented a hat-ulybayku. This gadget can detect
smiling or not. In the hat is a special touch sensor, which is adjacent to the cheek, and measures the width of a smile.
If a person is sad, special motor causes the metal rod at the base cap dig into his head.
Once a person lights up a smile, tongue ceases to pressure head. They say that continuous use of Cap-ulybayki
can train the brain to smile around the clock. That looks like this device.