Fascinating visualization of a black hole surrounded by an accretion disk, illustrating how light is warped by its intense gravitational fields.
During winter hibernation, some turtles can take in oxygen directly from the water through a process called cloacal respiration, breathing through their rear.
Acquaintance cards, a discrete form of flirting during victorian era cards and some early turn of the century. 1880s-1920s.
Saturn’s north pole is home to a giant hexagonal storm about 30,000 km (18,600 miles) wide—large enough for more than two Earths to fit inside. First spotted in 1980, it’s still raging today.
A mature Giant Sequoia can use 2000 liters of water every day during the summer. That’s why snowy winters are fundamental: with adequate water they can live over 3,000 years
