ओज़ोन परत का छेद 40 लाख वर्ग किलोमीटर हुआ छोटा हुआ

How many first year engineering students does it take to change a light bulb?
None. That’s a second year subject.
How many second year engineering students does it take to change a light bulb?
One, but the rest of the class copies the report.
How many third year engineering students does it take to change a light bulb?
“Will this question be in the final examination?”
How many civil engineers does it take to change a light bulb?
Two. One to do it and one to steady the chandelier.
How many electrical engineers does it take to change a light bulb?
None. They simply redefine darkness as the industry standard.
How many computer engineers does it take to change a light bulb?
“Why bother? The socket will be obsolete in six months anyway.”
How many mechanical engineers does it take to change a light bulb?
Five. One to decide which way the bulb ought to turn, one to calculate the force required, one to design a tool with which to turn the bulb, one to design a comfortable – but functional – hand grip, and one to use all this equipment.
How many nuclear engineers does it take to change a light bulb?
Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years