The Earth rotates at about 1,670 km/h at the equator, but you don't feel it because you're moving at the same speed. It's like being in a car with the windows up!
Lightning can reach temperatures of 30,000°C (54,000°F) - that's 5 times hotter than the surface of the Sun! The air around it expands so fast it creates thunder.
When a tennis ball hits the ground, it compresses and stores elastic potential energy. That's why it bounces back up - the energy is converted back to kinetic energy!
In a car crash at 60 mph, your body experiences the same force as falling from a 4-story building. That's why seatbelts and airbags are so important!
Ocean waves can travel thousands of miles across the ocean. The water itself doesn't move that far - it's the energy that travels through the water!
On some roller coasters, you can experience up to 4-5 G's of force. That means you feel 4-5 times heavier than normal. Fighter pilots can experience up to 9 G's!
GPS satellites have to account for Einstein's theory of relativity. Their clocks tick slightly faster than Earth clocks because they're in weaker gravity!
Figure skaters spin faster when they pull their arms in because of conservation of angular momentum. The same principle keeps Earth spinning and gyroscopes stable!