You can do this at home as long as you have a source of light, two fingers and a working eye.
Hold up your hand a couple of inches in front of your face with two fingers very close together.
Look at a more distant light source (not the sun) or light coloured object. I used my computer screen.
Now bring your hand in the way so that you can see part of the light object through the gap.
Try to keep focussed on the more distant object rather than your fingers.
You should be able to see some dark lines running parallel with the edges of your fingers.
These are interference patterns!
You have just re-created the same effect that is seen in the most famous physics experiment of them all - the double slit experiment - well kind of.
How cool is that?
Here is a picture- see for your self.
You can just about make them out on the picture - they are much clearer in reality.
Next week we will be attempting to achieve fusion using three sheets of toilet paper, a paperclip and a bicycle pump.