Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Self-made millionaire Harris Rosen adopted a Florida neighborhood called Tangelo Park, cut the crime rate in half, and increased the high school graduation rate from 25% to 100% by giving everyone free daycare and all high school graduates scholarships.
20
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13