AD and BC are used to label or number years. AD stands for Anno Domini. It refers to all of time that has passed after the Birth of Christ, whereas BC stands for Before Christ; it refers to all of time that...

The basic difference between virtual reality and augmented reality is that in virtual reality we go into the virtual world, whereas in augmented reality we bring the virtual world into the real world.

A telescope is optical instrument with a singular viewfinder that allows one to see and interpret far away objects. Binoculars have two viewfinders instead of one. Telescopes are ideally used to look at stars...

Earth is the third planet in our solar system. It is the planet that humans live on as well as other forms of life. Pluto is a dwarf planet within the solar system. It is located beyond Neptune, in the Kuiper...

Hard Work is when one does some work dedicatedly. Smart work is when someone does the same amount of work, but faster and more efficiently.