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How the light bulb became a million dollar idea.

The BBC's Aaron Heslehurst explains how the light bulb became a million dollar idea.

The couple whose "bhungroo" invention is protecting thousands of farmers from drought and monsoon floods.

The couple whose "bhungroo" invention is protecting thousands of farmers from drought and monsoon floods.

The BBC's Aaron Heslehurst tells us how the video game became a million dollar idea.

Aaron Heslehurst explains how the remote control became a million dollar idea.

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