I
would like to share something about the intelligence of people living
before 15th century,where there were no modern and mechanical
facilities.
Do you know how people used to wake up on time when world don’t even know the word “ALARM CLOCK”?
Prior
to 15th century people used to place the candle above a metal plate and
they create a makeshift alarm by inserting a nail into the candle at
the desired interval. When the wax around the nail melts it would drop
on to the metal plate below and make a noise.
C:- Panguluri Koundinya