n 1968, Alan Kay proposed the idea of a personal computer. Now, over 50 years later, these have become a staple of the high-tech world. Known for their lighter weight and more compact dimensions, laptops...

single-lens reflex camera, or DSLR, is the modern-day equivalent of a film camera. These use digital storage, often in the form of secure digital (SD) cards, which are a cheaper and sturdier alternative...