They met in 1980s when Melinda joined Bill's Microsoft firm. Together they have 3 children.
They have run the Bill & Melinda Gates Foundation. The organization has championed various causes including fighting infectious diseases and encouraging innoculations in children.
The Gates' - along with investor Warren Buffett - are behind the Giving Pledge, which calls on billionaires to commit to giving away the majority of their wealth to good causes.
According to Forbes, Bill Gates is at the number 4th spot when it comes to being wealthiest person in the world and his net worth is sitting at $124 billion.
He co-founded , Microsoft, the world's biggest software company in the 1970s that amassed him a fortune.
Once consumers understand that a flight costs more because its price includes a carbon offset, they are likely to choose that flight and pay their part of the offset.
Young adults who experienced annual income drops of 25 per cent or more might be more at risk of having thinking problems and reduced brain health in middle age, a study said.
The impulse to check official mails or social media updates makes one carry phones even to the toilet, but few people may be aware of the dangerous consequences of such a habit.
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