science daan Inventions kr rhay hain ..
Ab ap Light k baghair Din ko suraj ki roshni se Room me Bulb(light) on kren.
Krna ap ne ye hai k aik Bottle plastic ki leni hai (plastic ki botal hoti hai cold drink pepsi coca cola etc).
us bottle me pani bhr k us me 3 ya 4 chamch(spoon) bleech(kapry saf krny wali)
dal den.
Ab us bottle ko chatt(roof)me es trah lagaen k us ka adha hissa chatt se oopre nikla hua rhay.
ap ka 450 volt ka bulb tayyar.
Din k wqt No light ka kharch.
Agr pasand ay to
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