1. Primary data is a type of data that is collected by researchers directly from main sources through interviews, surveys, experiments, etc. Primary data are usually collected from the source—where the data originally originates from and are regarded as the best kind of data in research.

2. The significance of the study is a written statement that explains why your research was needed. It's a justification of the importance of your work and impact it has on your research field, it's contribution to new knowledge and how others will benefit from it.

3. Vision problems are common complaints of gamers. The most common vision problem is eye strain, which can lead to headaches and poor concentration. Gaming has been reported to result in seizures, leading to warnings on the packaging.