Professor began his class by holding up a glass with some water in it. He held it up for all to see & asked the students
"How much do you think this glass weighs?"
'50gms!' ..... '100gms!' .....'125gms' ...the students answered.
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"I really don't know unless I weigh it," said the professor, " but, my question is:
What would happen if I held it up like this for a few minutes?"
'Nothing' ..the students said.
'Ok what would happen if I held it up like this for an hour?' the professor asked.
'Your arm would begin to ache' said one of the student
"You're right, now what would happen if I held it for a day?"
"Your arm could go numb, you might have severe muscle stress & paralysis