Let me sum up if you didn't:
People can make a difference.
Tiny actions combine to make beautiful things - to make our world better.
That seed bank, with a few seeds from each country, will grow to make a forest.
That forest will help to absorb the CO2 in the atmosphere, and make our world a better place.
I'll highlight at this point the female 100m runner Kamia Yousufi, who carried the flag for Afghanistan.
She is the only female member of the Afghan team - but as the team is made up of only three athletes, this makes her a third of the team overall.
Kamia Yousufi - and so many others like her - is an inspiration.
These women are the first tentative steps in the fight for women's rights and representation. They are amazing.
And the refugee team is inspiring.