US President Donald Trump directed FBI to "holistically review" the deaths and disappearances of 11 scientists, seemingly linked to UFOs and nuclear research, since 2022. While talking to reporters about it, Trump said, "[It's] pretty serious stuff...Hopefully, it's a coincidence...some of them were very important people." He added that they'll know more over the next week and a half.

The Lyrid meteor shower will peak between April 21 and April 23 from after midnight until dawn, which are the best days to watch it. Under ideal conditions, it can produce around 15 to 20 meteors/hour. To see the meteor shower, one needs to find Vega, one of the brightest stars in the night sky at this time of year.

Scientists in China have demonstrated a wireless power transmission system that uses a ground-based microwave emitter to beam energy to an antenna array mounted on a drone's underside. Importantly, they were able to do this while both the drone and the charging system were in motion. Meanwhile, Analysts said such systems could extend the operational reach of ground forces.

A major study reveals that many of the world's river deltas are sinking faster than sea levels are rising, increasing flood risks for millions. Driven by groundwater overuse, reduced sediment flow and urbanisation, regions like the Ganges-Brahmaputra, Nile and Mekong are severely affected. Researchers warn that over 236 million people could face rising coastal dangers.

The Indian Space Research Organisation (ISRO) performed a record 140 collision-avoidance manoeuvres (CAMs) in 2025 to avoid 'space traffic' and protect Indian space assets, the highest for a year since 2010. One CAM was specifically conducted for the ISRO-NASA joint mission, NISAR, while two CAMs were conducted for Chandrayaan-2. CAM is performed by thrusting the satellite to avoid collision.

A major study finds that higher cardiorespiratory fitness is linked to better mental health and lower risk of depression, dementia and psychotic disorders. Even small improvements in fitness can significantly reduce risk, highlighting exercise as a key factor in protecting brain health and preventing mental and neurocognitive conditions.

NASA engineers have turned off a science instrument, called the Low-energy Charged Particles experiment (LECP), aboard Voyager 1, to keep the spacecraft operating. The nuclear-powered spacecraft is running low on power, and turning off the LECP is considered the "best way to keep humanity’s first interstellar explorer going", NASA said. The agency launched the Voyager 1 space probe in 1977.

Adults who feel lonely face up to a 23% higher risk of developing degenerative heart valve disease, including aortic valve stenosis and mitral valve regurgitation, a study published in Journal of the American Heart Association found. Analysing data from over 4.6 lakh UK adults over 14 years, researchers found loneliness independently raised the risk, partly through unhealthy lifestyle habits.

NASA's Apollo 11 mission became the first to land humans on the Moon on July 20, 1969. Neil Armstrong became the first person to step onto the lunar surface, followed by Buzz Aldrin, while Michael Collins remained in orbit. The mission symbolised a major breakthrough in space exploration during the Cold War era.

New research from IISc and ICTS-TIFR shows that sewage monitoring acts as an accurate mirror of community health. Using areawise mapping technologies by linking specific neighbourhoods to treatment plants, they have achieved mapping 14 million people's waste easily. They show that disease can be tracked at a granular level.