Smart Professer: Hey i invented this special torchlight! It works on solar energy.
Ordinary Student: COOL PROF! so how does it work.
Smart Professer: see this panel here? It confirm energy from the light to power up
the torch.
Ordinary Student: SO the torch can only be used in the day?
What happen when there is no light?
Smart Professer: Oh simple. When there is no light, u just have to use another torch
light and shine at it to provide the light source
Ordinary Student: WOW! That's the greatest invention of the century!
Borrowed from stephen chow movie 'ling ling qi'
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