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Last updated at 11:03 BST, Thursday, 29 September 2011

An ingenious invention

Water bottles

Water bottles used for creating cheap lighting

Rob and Cath talk about an ingenious invention which is bringing a bit of brightness into the lives of the poorest people in the Philippines.

This week's question:

How many islands make up the Philippines? Is it:

a) 107

b) 707

c) 7107

Listen out for the answer at the end of the programme!

Listen

An ingenious invention

End of Section

Vocabulary

ingenious

very clever

slums

areas of a city where living conditions are very bad

obstacle

something which makes it difficult to go forward or do something

insignificant

not important

virtually

almost entirely, nearly

necessity

the need to do something

essentially

in a fundamental or basic way

algae

plant-like organism living mainly in water

refracted

here, a ray of sunlight which changed its path where it entered water

economical

does not require a lot of money to operate

watts

units of measurement of electrical power

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