Physics
Choose the most appropriate answer: Natural radioactivity was discovered by

Enrico Fermi
Henry Bacquerel
Marie Curie
Earnest Rutherford

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Frost makes the pipes rusty, so they break
None of these
The material of which pipes are made contracts due to cold and so breaks
Water in the pipes freezes and on freezing water expands, so pipes break

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