1) The Black Lives Matter movement gained renewed momentum in 2020 following the killings of George Floyd, Breonna Taylor, and others, sparking protests and discussions on systemic racism, police reform, and social justice around the world.

2) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.

3) The first successful portable MP3 player, the Diamond Rio PMP300, was released in 1998 and could hold up to 60 minutes of music.

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