Can we turn back time? Ask a savvy physicist, and the answer will be “it depends.” Schemes for retrograde time travel abound but usually involve irreconcilable paradoxes and rely on outlandish ...

Here’s what you’ll learn when you read this story: For more than 50 years, scientists theorized that an electromagnetic wave could be reflected temporally—not just spatially. Scientists have been ...

Light is part of various disciplines, shaping the world as we know it. In physics, it serves as a measure of speed and makes vision, and the recording of images by the eye and camera lens possible.