1) The Amazon rainforest produces more than 20% of the world's oxygen.

2) The world's first stock exchange was established in Amsterdam in 1602.

3) The Black Lives Matter movement, which gained prominence in 2013, advocates for racial justice and equality, addressing systemic racism and police violence against Black individuals.

4) The world's oldest tree is believed to be a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.