the sun

The sun makes people happy because it releases seratonin in the blood. Seratonin is a chemical which is releases in the brain causing happyness, lots of talk and also causes excitment!
The sun also makes people happy because most people go away or do something exciting when it is sunny ,then the memory of the sun they have will always be remembered as they had a great memory. So when people see that it's sunny it automatically boost their spirits.