Since our ancient human relatives began using stone tools to perform tasks, humans have harnessed scientific knowledge and new technologies to expand the boundaries of our understanding of the natural world. From quantum computing and microplastics to artificial intelligence and memory, explore these topics and more with our concise yet informative overviews and expert-curated resources.
Hours of research by our editors, distilled into minutes of clarity.
The equations of special relativity require these objects to possess imaginary mass, and they would travel faster the more energy is taken away from them. The existence of tachyons would necessitate an unknown form of matter and lead to paradoxes involving information that can hypothetically travel backward in time.
Just after the Big Bang, the high-density universe prevented light from traveling very far before being absorbed and emitted repeatedly by free-floating particles. As the universe expanded, electrons and protons combined to form hydrogen, thereby freeing up space for light to travel unimpeded, creating the background light we observe today.
Humans possess receptors that are sensitive to the red, green, and blue wavelengths of light. These receptors send signals to the brain, which are processed and mixed to produce the array of colors we observe, including magenta, pink, and others that lack a corresponding natural wavelength in the visible spectrum.
All forms of electromagnetic radiation, from radio waves to gamma rays, travel at the speed of light in a vacuum, but their wavelengths decrease as their frequencies increase. The light-sensitive nerve cells in the human eye are sensitive to a narrow range of values, which we observe as the spectrum of visible light.
Isaac Newton first identified white light as composed of a spectrum of colors, which he believed consisted of particles of different hues. Various light phenomena, including refraction, led Christiaan Huygens to develop an alternative wave model. Quantum mechanics validated both models through the concept of wave-particle duality.
This CNET preview outlines what’s coming at CES 2026—from major showcases by Samsung, Sony, LG, and Lenovo to expected trends in AI, chips, digital health, mobility, and robotics.
Longtime CES spokesperson Allie Fried discusses how the show has grown in scale, global reach, and ambition. The podcast also highlights recent tech innovations showcased at the show, including an AI baby panda that can sense emotions and robotic companions for Alzheimer’s patients.
This gallery showcases rare photos from the early decades of CES, featuring early personal computers and the first handheld cassette players. See how the world’s biggest tech show began and grew.
CES 2026 features keynote speakers including entrepreneur and "All-In" podcast cohost Jason Calacanis, and Lenovo Chairman & CEO Yuanqing Yang—part of a lineup spotlighting voices shaping the future of tech and business.
Within simulations of these clouds, gravity, jets, supernovae, and galactic motion-induced stirring have been shown to develop turbulence that creates shocks. These turbulent shocks move quickly in low-density regions and slow in high-density areas, forming lumps of matter with sufficient gravitational force to collapse and initiate fusion, birthing a star.
