The sub-zero temperatures make it a perfect day to try out some cold weather experiments. Fox Mankato's Carly Aplin is taking the classroom outside today to show us what myths were busted and which ones stood up to the test. It's time to prove Minnesota winters can be fun and educational..."I've never seen that..""That's a pretty fun experiment."We all know that at 32 degrees Fahrenheit water freezes...But at 15 below zero all bets are off... With any good experiment you need to use a control...Normally a banana cannot hammer a nail through a block of wood...But how long does it take and how cold does it have to be to turn that banana into a household tool. "Now we have a banana that's been sitting outside since 9:30 this morning."After five hours in the 15 degree below zero weather... this banana could double as a hammer. It's definitely driving the nail here..." It's in there pretty far too..."So far...in fact... that the nail was nearly impossible to pull out... When it gets this cold even everyday items can become a scientific phenomenon. "You can see it freeze almost instantly and shatter it's so brittle." When bubbles are blown they adopt a round shape... and bounce around as air currents hit them...But that all changes in the cold. "When it becomes frozen solid it can't move around anymore, it's just rigid the slightest breeze just shatters it... it's such a thin, thin film.""The last bubble froze from the bottom and you could see it... your air kept the top part of it thawed and the bottom part colder... and it shattered." Let's move on to the balloons then...")It may not be cold enough outside for a balloon to lose shape... but it definitely doesn't pack the same punch when you pop it...""It's not a normal pop for a balloon."A normal balloon at room temperature is very elastic... so when you pop it... it explodes... But after 5 hours in the cold it loses that snap. "It slowly deflates.. it really holds its shape...it's really lost all its elasticity it can't squeeze itself anymore... it's too cold."These experiments may not have all gone as expected... but we definitely learned a lot trying them out..."Does it take these extreme temperatures to do this or could we do this at 5 degrees... ten degrees...""It takes these extreme temperatures to freeze a banana to use as a hammer it needs to be at least -13 below, -14 below... these temperatures make a difference.15 degrees below zero was the perfect temperature to make a difference in today's cold weather experiments...In Mankato, Carly Aplin, the Fox Mankato News at Nine.