The Earth has been naturally radioactive since its formation. This natural radioactivity is found in the soil, rocks, air, and food, generating internal heat and contributing to environmental radioactivity.
A lion’s roar can be heard up to 5 miles (8 km) away
Their vocal folds are specially structured to create powerful, low-frequency roars with minimal lung pressure.
Hacia el 1300 surgieron los primeros relojes mecánicos en Europa, instalados en campanarios, que revolucionaron la organización urbana y agrícola al medir el tiempo mediante toques de campana
