Scientists are very good at taking two completely different events and showing that they are closely connected in someway.

One very important example of this is due to someone called Isaac Newton.

Now the story goes something like this. Good old Isaac was sitting under an apple tree in his garden one day. Suddenly, one of the apples fell and crashed on his head. That got him thinking (once the bump had gone down of course!).

``Why did the apple fall towards the Earth?

Why did it not ``shoot upwards'' when it came away from the branch?

And, why did I plant that stupid apple tree anyway?!!''

Newton came up with the idea that the Earth must attract the apple towards it with some ``unseen force''. He named this force

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