Enlarge / A pedestrian walks past a flown Falcon 9 booster at SpaceX headquarters in Hawthorne, California, on Tuesday, the same day Elon Musk said he will relocate the headquarters to Texas. (credit: Frederic J. Brown / AFP via Getty Images)

Elon Musk said Tuesday that he will move the headquarters of SpaceX and his social media company X from California to Texas in response to a new gender identity law signed by California Governor Gavin Newsom.

Musk's announcement, made via a post on X, follows his decision in 2021 to move the headquarters of the electric car company Tesla from Palo Alto, California, to Austin, Texas, in the wake of coronavirus lockdowns in the Bay Area the year before. Now, two of Musk's other major holdings are making symbolic moves out of California: SpaceX to the company's Starbase launch facility near Brownsville, Texas, and X to Austin.

The new gender identity law, signed by Governor Newsom, a Democrat, on Monday, bars school districts in California from requiring teachers to disclose a change in a student's gender identification or sexual orientation to their parents. Musk wrote on X that the law was the "final straw" prompting the relocation to Texas, where the billionaire executive and his companies could take advantage of lower taxes and light-touch regulations.

Enlarge (credit: Getty | Yui Mok)

The strain of H5N1 bird flu isolated from a dairy worker in Texas was 100 percent fatal in ferrets used to model influenza illnesses in humans. However, the virus appeared inefficient at spreading via respiratory droplets, according to newly released study results from the Centers for Disease Control and Prevention.

The data confirms that H5N1 infections are significantly different from seasonal influenza viruses that circulate in humans. Those annual viruses make ferrets sick but are not deadly. They have also shown to be highly efficient at spreading via respiratory droplets, with 100 percent transmission rates in laboratory settings. In contrast, the strain from the Texas man (A/Texas/37/2024) appeared to have only a 33 percent transmission rate via respiratory droplets among ferrets.

"This suggests that A/Texas/37/2024-like viruses would need to undergo changes to spread efficiently by droplets through the air, such as from coughs and sneezes," the CDC said in its data summary. The agency went on to note that "efficient respiratory droplet spread, like what is seen with seasonal influenza viruses, is needed for sustained person-to-person spread to happen."

Enlarge / The rocket for SpaceX's fourth full-scale Starship test flight awaits liftoff from Starbase, the company's private launch base in South Texas. (credit: SpaceX)

The Federal Aviation Administration approved the commercial launch license for the fourth test flight of SpaceX's Starship rocket Tuesday, with liftoff from South Texas targeted for just after sunrise Thursday.

"The FAA has approved a license authorization for SpaceX Starship Flight 4," the agency said in a statement. "SpaceX met all safety and other licensing requirements for this test flight."

Shortly after the FAA announced the launch license, SpaceX confirmed plans to launch the fourth test flight of the world's largest rocket at 7:00 am CDT (12:00 UTC) Thursday. The launch window runs for two hours.