A modern dating method has revealed the oldest Homo sapiens' footprints yet, placing bipedal humans in South Africa around 153,000 years ago.
During the Tunguska event, over 8 million trees covering an area of 830 square miles were flattened when an asteroid entered Earth's atmosphere.
About 40 ancient rock carvings have been found on a former rocky island in Sweden.
Experts agree that all else being equal, it is better to vape than to smoke traditional cigarettes, but e-cigarettes come with their own risks.