Enjoy special guest takeovers, music mixes, and a whole host of brilliant storytelling this Christmas on BBC Radio and BBC ...

Sound as we know it does not exist in space. That’s because, on Earth, sound mainly travels to our ears via vibrating air molecules. Because space is a vacuum, meaning there is no matter at all ...

Army, Navy, and Air Force are the three major defense services in India. The commissioned officers and personnel below officers working in these armed forces enjoy ranks that are equal to one another.