the deadliest animal to humans is the mosquito - over 600,000 deaths each year. [ref] : 2023
World War I - about 10 million dead soldiers, 8 million dead horses, civilian deaths about 6-13 million. [ref] : 2022
World War II killed 70–85 million people - about 3% of planet's population. Poland was the most affected - over 18% of the population perished. [ref] : 2022
separate studies consistently show a decline in human intelligence - more than 10% in the last 50 years. [ref] : 2022
Speed needed to escape Earth gravity - about 11.2 km/s - would cause most objects to burn up due to air friction. A spacecraft is first placed in low orbit and then accelerated to the escape velocity at that altitude - about 10.9 km/s [ref] : 2022