Gravitational-wave astronomers have for the first time detected a collision between two black holes of substantially different masses—opening up a new vista on astrophysics and on the physics of gravity. The event offers the first unmistakable evidence from these faint space-time ripples that at least one black hole was spinning before merging, giving astronomers rare […]
A serious concern since the emergence of Covid-19 has been whether those who have had it can get it a second time – and what that means for exiting this … source
In the aftermath of disasters like 9/11, Katrina and the 2008 financial crisis, Americans had the opportunity to judge the response from the federal government and evaluate how the past had prepared us for 21st-century emergencies. These whole-country hardships presented the United States with fuel for change in public sentiment towards the relatively familiar issues […]
Experts see a way to help cities prepare for tropical storms that will likely be larger, less predictable and more damaging than hurricanes of the past. One focus is on inland areas that have recently come within reach of stronger climate-driven hurricanes and stand to benefit from improved emergency planning and stronger building codes. The […]
Peut-on avoir le coronavirus sans le savoir ? Y a-t-il des remèdes naturels ? Où en est-on du vaccin ? Michel Cymes répond simplement à toutes les questions … source
Solar panels perched on the roofs of houses and other buildings are an increasingly common sight in the U.S., but rooftop wind systems have never caught on. Past efforts to scale down the towering turbines that generate wind power to something that might sit on a home have been plagued by too many technical problems […]
Originally published in April 1956 Credit: Scientific American Advertisement “The U.S. will release 88,000 pounds of fissionable uranium 235 for research and development and for fueling nuclear power reactors, President Eisenhower announced last month. Half of the uranium will be sold or leased to approved groups in the U.S.; the rest will be available to […]
What happens when you catch coronavirus? The Telegraph’s Global Health Security Editor Paul Nuki explains all the ways in which you could become infected … source
Little is more enticing than the prospect of seeing alien worlds around other stars—and perhaps one day even closely studying their atmosphere and mapping their surface. Such observations are exceedingly difficult, of course. Although more than 4,000 exoplanets are now known, the vast majority of them are too distant and dim for our best telescopes […]
Mensaje sobre COVID-19. Viernes 27 de marzo 2020. Presidente AMLO. Mensaje especial al pueblo de México Sigue las actividades del presidente de … source