Rio Olympics: The surprising fact you may not know about 2016 medals

Updated: 

It seems Rio 2016 medals will be the heaviest in Olympics history.

The medals are the same diameter (8.5cm) as those won by athletes at London 2012, but are 100g heavier - as this graphic shows:

Snappa graphic.

They are much bigger than those offered to athletes 108 years ago when the medals weighed just 21 grams.