Published on: March 9, 201552 Hertz Whale Often described as the world’s loneliest whale, the 52-hertz whale calls out at frequency of 52 hertz a much higher frequency than the vocalizations of the most other whales. Scientists are certain that the sonic signature is that of a whale, but the exact species remains a mystery. […]
Published on: May 6, 20156. Teotihuacan, Mexico Teotihuacan is an archaeological site near Mexico City. The city is filled with pyramids and is about 20 square km (8 sq miles). It was a huge urban center and home to probably 100,000 people. The city was ruined and abandoned some 1,400 years ago. Centuries after it was forgotten, the city […]
