Lecturer, Pharmacology, Women's Health, School of Biomedical Sciences, The University of Western Australia For millennia, humans had one obvious and reliable source of light – the Sun – and we knew ...

Here is the history of light, according to physics. Beyond what we can touch, taste, smell, and hear, we experience the universe through light. But how did we come to discover light, and how did we ...

The story of humans trying to use light and heat to their benefit goes back to prehistoric times. The earliest use of fire for these purposes led to torches, oil lamps, candles, gas systems, and ...

The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...