Education Top 10 videos

10 things you don’t know their purpose of making it

10 things  you don’t know  their purpose of making

you will wonder if  you know  their  purpose of  making  it  some of  them  we see daily and we use daily but still we don’t any  thing about it

Its really  sad that we don’t have any idea about  it  for example

1.why  there is a little hole on back of my smart phone ? it is between  lens and flash on a smart phone?

2.why  utility knife had cap  on back  ? what is  its purpose ?

3.why  button on lids ?

4.mettle plate on stapler

5.hole at the  end of the  lollypop stick

6.lid for drinks

7.hole in  a pen  cap