When combusted in the presence of oxygen, hydrogen (the lightest element on the periodic table) transforms into water, a chemical process that yields almost no visible light. To see such a flame at ...

The flame at Tokyo’s National Stadium and another cauldron burning along the waterfront near Tokyo Bay throughout the games will be sustained in part by hydrogen, the first time the fuel source ...

Naomi Osaka stands beside the Olympic flame after lighting it during the opening ceremony in the Olympic Stadium at the 2020 Summer Olympics, Friday, July 23, 2021, in Tokyo, Japan.

Naomi Osaka stands beside the Olympic flame after lighting it during the opening ceremony in the Olympic Stadium at the 2020 Summer Olympics, Friday, July 23, 2021, in Tokyo, Japan.

The flame at Tokyo’s National Stadium and another cauldron burning along the waterfront near Tokyo Bay throughout the games will be sustained in part by hydrogen, the first time the fuel source ...

The flame at Tokyo’s National Stadium and another cauldron burning along the waterfront near Tokyo Bay throughout the games will be sustained in part by hydrogen, the first time the fuel source ...

The flame at Tokyo’s National Stadium and another cauldron burning along the waterfront near Tokyo Bay throughout the games will be sustained in part by hydrogen, the first time the fuel source ...

The flame at Tokyo’s National Stadium and another cauldron burning along the waterfront near Tokyo Bay throughout the games will be sustained in part by hydrogen, the first time the fuel source ...