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wavelength
Why are sunsets red?
The answer comes from the physics of waves.
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Doppler detectives
Researchers observe the Inverse Doppler effect for the first time.
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Light bends the 'wrong' way
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Radio controlled?
We take reliable radio communications for granted, but accommodating many different users is not easy.
Robert Leese
explains how the mathematics of colouring graphs can help avoid interference on your mobile phone.
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