Near the island of Mauritius, there appears to be a giant underwater waterfall flowing into the ocean. In reality, it is an optical illusion created by sand and silt being pulled down underwater slopes by strong ocean currents. From above, the...
Some birds, such as the great frigatebird, can sleep while flying during long journeys over the ocean. Scientists discovered that these birds use unihemispheric slow-wave sleep, meaning one half of the brain sleeps while the other half stays...