Some moments can change everything – and also leave an indelible mark on those who witness those moments.

"I have been fortunate to do some very exciting things in my lifetime. But helping a young girl to hear for the very first time was one of the most rewarding experiences I have ever had," said Sir Richard Branson on his blog.

With the help of Branson, free hearing aids were fitted to almost 400 people in Africa, including those at a healthcare clinic in South Africa opened by Branson's Virgin Unite in 2007.

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Guided by a deep concern that people around the world go deaf needlessly, William F. Austin has provided 200,000 hearing aids every year to children and adults in need. Since 1984, his Starkey Hearing Foundation has provided more than 1.8 million hearing aids to people in more than 100 countries.

Austin and his team were in the Philippines providing free hearing aids and care to more than 9,000 Filipinos the following three weeks.

"It is amazing how simple the hearing aid is, and what a profound impact it can make," wrote Branson. "I can't begin to imagine how life-changing hearing all of the wonderful noises in the world for the first time would be."

Watch one young lady first experience it in the video below…