String theory proposes the existence of up to 11 dimensions, most of which are curled up and invisible to us. elaborate
A tiny amount of antimatter is naturally produced in Earth's atmosphere when cosmic rays collide with air molecules. elaborate
The grandfather paradox, a classic time travel conundrum, is actually a plot device more than a scientifically sound problem, as it assumes a fixed, linear timeline that might not exist in theoretical models of time travel. elaborate
String theory requires more than the usual three spatial dimensions and one time dimension; it proposes the existence of extra, curled-up spatial dimensions that are too small to observe directly. elaborate
Terahertz radiation can penetrate many non-metallic materials like clothing and packaging, making it useful for security screening but also potentially for medical imaging. elaborate