Fossilized footprints, preserved in gypsum mud that hardened over time, are estimated to be 23,000-21,000 years old. NPS / Alamy Ancient human footprints, preserved in a dry lakebed at White Sands ...

North Korea's Kim inspects memorial for soldiers who died in Russia mission North Korean leader Kim Jong Un and his daughter Ju Ae on Monday inspected the construction of a memorial for North Korean ...