The blue colour of the clear sky is due to
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As you go down into a well, your weight
Which one of the following types of laser is used in laser printers?
'Pencillin' which is used as an antibiotic is obtained from
The power of a lens is measured in:
Special 3-D photographs which have been taken with laser beams (and which make the objects look real) are called what?
The amount of water vapour in the air is called...?
What invisible force holds you onto the earth, so that you don't simply fall off?
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