Descriptions of the object varied, with some likening it to a "big black floating bag" or a "rectangle-shaped" entity that didn't resemble any known drone or kite. Social media erupted with ...

Known as 'sea dragons' or 'tidal kites', they look like aircraft, but are in fact high-tech tidal turbines, generating electricity from the power of the ocean. So, how does the technology work?

For 20 years, two brothers living in the squalid neighbourhood of Wazirabad in India's capital, Delhi, have been treating wounded black kites that fall from the city's leaden skies. Mohammad Saud ...