404 participants pose for a photo during the "Next Einstein" competition which set a Guinness World Record for the "largest gathering of people dressed as Albert Einstein" in Toronto, Canada, March 28, 2017. World Population Day falls on July 11th every year. It was first observed on 11 July 1987, when the world population reached 5 billion. Here's a throwback to the "power of numbers" that hit the records all across the world. [Photo: VCG]

Indian Prime Minister Narendra Modi participates in a mass yoga session along with other Indian yoga practitioners to mark the International Yoga Day at Rajpath in New Delhi on June 21, 2015. World Population Day falls on July 11th every year. It was first observed on 11 July 1987, when the world population reached 5 billion. Here's a throwback to the "power of numbers" that hit the records all across the world.[Photo: VCG]

Aerial view of over 2,000 enthusiasts making the shape of Tai Chi Diagram while practicing tai chi at the opening ceremony of the first Tai Chi Festival in Nanchang city, east China's Jiangxi province, 25 November 2017. World Population Day falls on July 11th every year. It was first observed on 11 July 1987, when the world population reached 5 billion. Here's a throwback to the "power of numbers" that hit the records all across the world. [Photo: IC]

The biggest human Christmas tree set a new Guinness World Record at the Plaza La Democracia, in Tegucigalpa on December 1, 2014. World Population Day falls on July 11th every year. It was first observed on 11 July 1987, when the world population reached 5 billion. Here's a throwback to the "power of numbers" that hit the records all across the world. [Photo: VCG]

A karate demonstration is performed by 3,973 people on Oct. 23, 2016, in Japan's Naha. The performance was recognized as the largest mass karate demonstration by Guinness World Records. World Population Day falls on July 11th every year. It was first observed on 11 July 1987, when the world population reached 5 billion. Here's a throwback to the "power of numbers" that hit the records all across the world. [Photo: VCG]

28 people cramming into a Mini which set the New Guinness World Record was done by Dani Maynard and her team in London, United Kingdom, November 15, 2012. This was to raise funds for Children in Need. World Population Day falls on July 11th every year. It was first observed on 11 July 1987, when the world population reached 5 billion. Here's a throwback to the "power of numbers" that hit the records all across the world. [Photo: VCG]