The Amazon Rainforest isn't actually the Earth's lungs. Most of the oxygen produced by the Amazon is consumed by its own ecosystem. Tiny organisms called diatoms are responsible for producing 40% of the Earth's oxygen. These diatoms reproduce rapidly, spreading across the oceans and producing oxygen through photosynthesis. When diatoms die, they form underwater particles that settle on the sea floor. As seas dry up, these dead diatoms turn into salt deserts, like those in Northern Africa. Massive sandstorms then carry the diatoms across the oceans, depositing them on the Amazon Rainforest, where they act as fertilizer. Diatoms originate in the rainforest, spread to the ocean, produce oxygen, die, create salt deserts, and are transported back to the rainforest, thereby supporting the very ecosystem that generates them.
Most people are aware that mosquitoes are the deadliest animals in terms of total human deaths, second only to humans themselves. This is due to the malaria parasite they spread. It's estimated that four to five percent of all humans who have ever lived died from malaria, not half as some sources claim. The treatment for malaria is quinine, known since the 1700s and often found in tonic water, which is bitter and not very palatable. The anecdotal story goes that during British colonization of India, the British East India Company faced malaria issues. Since drinking tonic water was unpopular, they added gin, creating the gin and tonic. Modern research shows that a significant amount of tonic water (~1 liter) is needed for a minimal effect, making the story largely apocryphal. However, it's interesting to think that we turned the treatment for one of humanity's worst diseases into a cocktail.
We no longer use this treatment because it had a mortality rate of 15%, although this was much lower than the death rate for syphilis. Unfortunately, many parts of the world still suffer from malaria, where it remains a major killer.
Elephants are known to cover their dead with foliage and stay near the bodies for a while, showing behavior similar to human mourning. This display of apparent grief is what distinguishes a 'burial' from merely covering or disposing of a body.
I also found out that they have buried humans too.