'Hack or Whack!' is back

It's another edition of our "Hack or Whack!" segment.

We've all seen those videos or stories about great short cuts to do everyday things either simply or without the need of expensive gadgets. Well we are here to put them to the test - so you don't have to!

Wednesday's segment covers these three hacks:

HOW TO SHARPEN A KNIFE ON A COFFEE CUP


VACUUM SEALING FOOD WITHOUT AN EXPENSIVE SEALER



SCHOOL GLUE NO-MESS MANICURE


Were these "hacks" (meaning yes, they are great!') or "whacks" (meaning it didn't live up to the hype).