Pure quartz crystals have been spotted on Mars for the first time, as well as other gems like opal. Researchers say these crystals, as well as being evidence of past hydrothermal activity ...

Similarly, some high-end materials, such as marble, require regular maintenance. Calacatta quartz countertops, meanwhile, are appealing to many homeowners who are about to embark on a renovation ...

It results from increased pressure in a large vein called the vena cava. JVD can signify heart failure and other cardiovascular problems. Doctors refer to the pressure in the vena cava as jugular ...