Scientists believe that the event leading to the extinction may have been a massive asteroid impact or huge volcanic activity. Events such as these could have blocked out sunlight and significantly changed the Earth's ecology.

When a drone (a male honey bee) mates with a queen bee, its abdomen is ripped open during copulation and it dies soon after.

Deliberately infecting people with malaria has been used to cure different viral infections. The high fever will strengthen the immune system and fight the virus. In recent times this has been considered as a treatment to HIV.

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