Physics
Radio telescopes are better than optical telescopes because

they can detect faint galaxies which no optical telescope can
they can work even in cloudy conditions
All of these
they can work during the day and night

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Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
The temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.

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