Metaverse is a vision of a highly immersive and interactive shared world inhabited by avatars of real people that will enable billions of people to work, play, collaborate and socialize in entirely new ways. As a concept, the Metaverse is a persistent, online, 3D universe that combines multiple virtual spaces. …

The global elderly population is expanding at an unprecedented pace, raising significant concerns about age-related health conditions and their socioeconomic impact. In 2019, there were 703 million persons aged 65 years or over in the global population. This number is projected to double to 1.5 billion in 2050. Globally, the …

The transmission loss of the light passing through the optical fiber is a very small value of less than 0.2 dB per km with a light wavelength in the 1,550 nm band. Therefore clearest optical fibers can transmit signals more than 100 kilometers without amplification-much farther than copper wires. When …