processing chips process large chunks of video, and powerful compression software means fewer bits need to be transmitted to create virtual reality images. Samsung, Facebook's www.TechnicalPDF.com Oculus Rift, Sony, Dell, Leap Motion, and Google manufacture virtual reality headsets. See Figure 1-9 for an Oculus Headset. www.TechnicalPDF.com Figure 1-9 A VR headset. (Photo by cheskyw/123RF) software Open Source software developer Unity provides a tool for creating virtual reality applications a that 3-D majority of the about 2 million virtual-reality developers use to develop virtual reality applications. In www.TechnicalPDF.com addition, Google, Facebook, Apple, and Amazon are developing virtual reality capabilities for their smartphones and web sites. The most commonly used virtual reality applications are video games. Additional applications under development or in use include: Live televised sports events that people with headsets and compatible smartphones can view. VR provides 360-degree views of sporting events from all angles: front, sides, and back. Training professional athletes with simulation of tactics. Real estate applications where prospective buyers see homes for sale without actually having to travel to each home. A remodeling virtual reality application being tested by Loews that enables customers to envision how remodeling projects will look. Social network posts that enable people to connect with each other in a more personal way using posts in virtual reality formats to share experiences and feelings. Medical training that involves virtual reality videos for operating nurses and anatomy courses where students use VR to learn anatomy and gain "first-hand" knowledge of steps in medical procedures. Drones with high-quality cameras that capture images on the ground in virtual reality format. Technical and Content Availability Challenges One of the current issues with virtual reality is that it can create nausea in viewers. This is because people turn their heads faster to look at images than curre