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When we put rubberbands around our fingers our flow of blood stops and due to lack of blood the fingertips become cold and white

:) why do our fingers become wrinkled when kept in water? :mad:

:mad: why do our fingertips become white and cold when we put rubberbands around them?:confused:

:o why do we get a echo sound in empty rooms? :p

:rolleyes: why do people living different reigons have different skin colours? :confused:

:) why doesn't the blood of the people living in polar reigon freeze? :rolleyes:

:D why doesn't iron rust in the body ? :cool:

:confused: why doesn't huge stones which are over each other fall off :rolleyes:

When we read for along time especially in sitting posture the carbon dioxidelevels in the body increases. The brain send signals inducing sleep to conserve oxygen for essential functions of the body.

:confused: why do we feel sleepy after reading for a long time? :confused:

:D Why do we get a smell immediately after the first shower of rain? :rolleyes: