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

2) The national animal of Canada is the beaver.

3) The Bora Bora island, located in French Polynesia in the Pacific Ocean, is renowned for its stunning turquoise lagoons, white sandy beaches, and luxury resorts. It is a popular destination for honeymooners and those seeking a tropical paradise getaway.

4) The Russian Revolution in 1917 resulted in the overthrow of the monarchy and the establishment of a communist government under Vladimir Lenin.