Most linear accelerators are energy hogs, but a new model recovers waste energy that can be ploughed back into the system.
On Jan. 4, 2010, Dubai opened the world’s tallest tower, the Burj Khalifa, standing at an impressive 828 meters tall. It had been six years in the making, with the excavation works taking place in January 2004 and the external cladding of the structure completed five years later in September 2009.
Its opening ceremony was televised around the globe at a time when the world was only just beginning to show signs of recovery after the worst recession in our lifetime, making a defiant stand for prosperity. Since the Burj Khalifa was opened, there has been talk of other, even taller towers, but currently that is all it has been — talk.
DUBAI: The day the Burj Khalifa was opened, it stood as a sign of prosperity at a time when the world was on its knees, crippled by the worst recession of our lifetime. Dubai had already rung in the new year, waving a relieved farewell to a turbulent 2009, with this vast 828-meter-tall tower acting as the center of the world’s highest firework display — its roots held solid in the foundations of Dubai Mall, one of the world’s biggest.
A centuries-old question surrounding Stonehenge has been solved, linking the tall megaliths to a geographic area where they may have come from.
The original source of the massive sarsen stones has long been debated, at least four centuries according to the study. The smaller “bluestones” near the center of the circular monument have been traced to an area in Wales, about 200 km away, in an earlier study.
Geologists used geochemical data from the sarsens and compared it to the geochemical signature of different regions.
Tesla has released its quarterly “Tesla Vehicle Safety Report.” One of the top reasons — if not the #1 reason — I bought a Tesla Model 3 last was because of its record-setting safety rating, so I’m always interested in seeing new stats on this topic.
The second quarter of 2020 saw a slightly worse result for Tesla than the first quarter in terms of accidents per million miles driven with Tesla Autopilot engaged (see graph below), but keep in mind that the first quarter had a record result. Additionally, the difference was so small that it was probably not statistically significant. On the other hand, Tesla’s Q2 figure was far better than the US average — about 10 times better with Autopilot engaged.
WASHINGTON — The Army National Guard will move most of its brigades under the command of its eight division headquarters as it reorganizes its fighting formations to give the force more combat power and some soldiers new career opportunities, officials said.
The Guard move will mark a substantial increase in the number of fully manned divisions that the Army can deploy, as only the service’s 10 active-duty divisions are now filled out with subordinate units, said Lt. Gen. Daniel Hokanson, the director of the Army National Guard. The increase to 18 complete Army divisions comes at a time when service officials believe a major conflict with a near-peer rival — namely Russia or China — would require the employment of full divisions, he said.
For the last two decades, the Army has focused on its smaller brigade combat teams as its primary fighting elements for counterterrorism operations and deployments focused on assisting the forces of other nations.
What are some skywatching highlights in August 2020? 🔭
You can see the Moon posing with various planets throughout the month, and catch the peak of the annual Perseid meteor shower. Find out when and where to look up: https://youtu.be/fuuUbYjN9Oo
Click on photo to start video.
Bob Behnken and Doug Hurley are returning to Earth after two months at the ISS
We will follow the NASA coverage of the SpaceX Dragon capsule undocking and splashdown.
#ICYMI This morning, the crew members of Expedition 63 currently aboard the International Space Station shared a few remarks as they bid farewell to NASA astronauts Bob Behnken and Doug Hurley.
After just over two months of being on the space station, Bob and Doug are scheduled to undock Crew Dragon Endeavour later today, which will commence the last portion of the SpaceX Demo-2 mission, the first crewed orbital spaceflight launched from the United States since the final space shuttle mission, STS-135, in 2011. #LaunchAmerica
Authorities in Florida say a 17 year old was the “mastermind” of the attack that targeted the accounts of Barack Obama, Joe Biden, Kanye West, Bill Gates and others.
Twitter’s headquarters in San Francisco on Oct. 21, 2015. David Paul Morris / Bloomberg via Getty Images file.
