Science Puzzle #3

In Mr Fong's Science class, they are holding a contest. Mr Fong has a glass bottle, and a little iron ball, the size of which is exactly the same as the hole in the bottle. Mr Fong is giving the student who can put the ball in the bottle, without breaking the glass or destroying the ball, a gameboy. In his class, there is a microwave, cooking oil, a stove, and a fridge.

Six of his seven students attempted this feat, but with no luck. After the sixth student, the seventh, Ben, comes up to the bottle and the ball. He thinks of using one of the tools in Mr Fong's class, and uses one (not the cooking oil as it was already proven not to work) and five hours later, gets the ball in the bottle and his free gameboy.

How did he do it?

Science Puzzle #2

Mdm Tan, a Science teacher and Mrs Chua, an Art teacher were arguing about what colour red mixed with blue makes. Mdm Tan said it made magenta but Mrs Chua said it made purple.

Who is correct?

Science Puzzle #1

After Mr MacDonald's wife made him give up his used chewing gum collection, MacDonald decided to start collecting fridge magnets. Eventually, he had enough to cover the entire fridge, much to his wife's dismay.

After several failed attempts to get rid of them, she finally gave up until one day, their fridge broke down. They looked at dozens of fridges, but finally settled on a top-of-the-line stainless steel model with two doors, icemaker and the works. MacDonald was reluctant to spend so much on a fridge till his wife told him to imagine how great his fridge magnets would look on it. That was all the motivation he needed.

However, once the fridge was in, he soon realized his wife had fooled him, and he would only be able to imagine his collection on the fridge from now on. But why, what had she done?

Leave your answers under comments :)