Volcanoes are dangerous. Even when they aren't hurling rocks, ash and lava at you, they can release potential toxic gases, crumble beneath your feet or send slurries down their slopes to wipe you away. When you hike on a volcano, you need to be aware of that risk. I'm not saying you shouldn't visit volcanic places -- you should because they are some of the most amazing landscapes on Earth! However, satiating your desire for risk needs to be balanced with not become another death on a volcano.Yet ...read more
There was a time when giant cranes did not dot the city skyline and when bulldozers, backhoes, and excavators did not yet exist. But even before these pieces of seemingly critical technology were invented, we had palatial estates, temples, churches, pyramids, and the like, all of which were built with none other than human ingenuity.But how were these mega-structures of yesteryear built? Let’s take a closer look. 1. The Great Sphinx of Giza(Credit: gumbao/Shutterstock) The Great Sphinx of Giz ...read more
Most space mission systems historically have used one spacecraft designed to complete an entire mission independently. Whether it was a weather satellite or a human-crewed module like Apollo, nearly every spacecraft was deployed and performed its one-off mission completely on its own.But today, space industry organizations are exploring missions with many satellites working together. For example, SpaceX’s Starlink constellations include thousands of satellites. And new spacecraft could soon ha ...read more
Earth’s oxygen is something of a puzzle. Until recently, scientists believed it is produced entirely by photosynthesis — plants using sunlight to convert carbon dioxide and water into glucose and oxygen.But earlier this year, oceanographers discovered an entirely new source of oxygen. Deep in Earth’s oceans, they found oxygen levels much higher than can be explained by photosynthesis alone, which typically occurs near the surface where sunlight can penetrate.The researchers concluded that ...read more
When you think of a fearsome, sharp-toothed predator, a squid probably isn’t the first animal that comes to mind. But these complex creatures have sophisticated eyesight, a strong beak to crush shells, and agile tentacles that help them snatch up prey.Oh, and they have teeth in their suckers. The serrated teeth inside the suction cups on their tentacles allow them to latch onto prey.While most hard tissues in animals are mineralized, with calcium fortifying their bones, shells, or teeth, the s ...read more
Author Vishay SinghPosted on Categories Discover Magazine