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

2) The word "bank" comes from the Italian word "banco," which means bench. In medieval Italy, bankers conducted their business on benches in the marketplace.

3) Sourdough bread is a type of bread made through a fermentation process that involves wild yeast and lactic acid bacteria. It has a distinct tangy flavor and a chewy texture. Sourdough bread is often considered healthier than conventional bread due to its potential benefits for digestion and nutrient absorption. It has gained popularity in recent years, with artisanal bakeries and home bakers reviving the traditional art of sourdough baking.

4) The most intense cyclone ever recorded was Cyclone Tip in 1979, with a minimum central pressure of 870 millibars and maximum sustained winds of 190 miles per hour (305 kilometers per hour).