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SAN FRANCISCO — Two weeks after closing a $44 billion deal to buy Twitter, Elon Musk painted a bleak financial picture for the social media company and outlined a series of changes for employees in his first companywide emails to staff.

In two emails sent to workers late on Wednesday, Mr. Musk said the economy was challenging. He added that he planned to end Twitter’s remote work policy and wanted employees to renew their focus on generating revenue and fighting spam.

“Sorry that this is my first email to the company, but there is no way to sugarcoat the message,” Mr. Musk, 51, wrote in one email. “The economic picture ahead is dire.” Twitter was too heavily dependent on advertising and vulnerable to pullbacks in brand spending, he added, and would need to bolster the revenue it gets from subscriptions.

This past Monday (Nov. 7th) I was given a behind the scenes look at Dr. Alfonso Fasano’s neuromodulation clinic, one of the busiest of its kind in the world.

On his schedule for that day were about 25 patients, which is fairly typical for him. But these were not exactly 25 patients that a typical doctor might see in a given day. They were patients whom the Canadian medical system had funneled to him, individuals who not even most movement disorder specialists, let alone neurologists or general practitioners, could properly treat. For him and his team though, it was just another Monday.

In the effort to efficiently convert heat into electricity, easily accessible materials from harmless raw materials open up new perspectives in the development of safe and inexpensive so-called thermoelectric materials. A synthetic copper mineral acquires a complex structure and microstructure through simple changes in its composition, thereby laying the foundation for the desired properties, according to a study published recently in the journal Angewandte Chemie.

The novel synthetic material is composed of copper, manganese, germanium, and sulfur, and it is produced in a rather simple process, explains materials scientist Emmanuel Guilmeau, CNRS researcher at CRISMAT laboratory, Caen, France, who is the corresponding author of the study. The powders are simply mechanically alloyed by ball-milling to form a precrystallized phase, which is then densified by 600 degrees Celsius.

The Celsius scale, also known as the centigrade scale, is a temperature scale named after the Swedish astronomer Anders Celsius. In the Celsius scale, 0 °C is the freezing point of water and 100 °C is the boiling point of water at 1 atm pressure.

China gave up on their SLS clone, deciding that building a giant rocket that blows up with every mission is a bad idea. Maybe Congress, who is forcing NASA to build the SLS, could learn from this.


When China started to get serious about sending its astronauts to the Moon in the middle of the last decade, the country’s senior rocket scientists began to plan a large booster to do the job.

In 2016 the country’s state-owned rocket developer, the China Academy of Launch Vehicle Technology, began designing the “Long March 9” rocket. It looked more or less like the large heavy lifter NASA was designing at the time, the Space Launch System. Like NASA’s large rocket, the Long March 9 had a core stage and boosters and was intended to be fully expendable.

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