Science

WASHINGTON – A health worker in Alaska had a severe allergic reaction after receiving Pfizer’s coronavirus vaccine on Tuesday, according to three people familiar with the man’s official health reports. The man was in the hospital under observation Wednesday morning. Government officials rushed to the scene on Wednesday to learn …

Entrepreneurial space companies can outperform any competition between NASA and China. By the time NASA or Chinese astronauts reach the moon, Elon Musk, the billionaire founder of SpaceX, says he will send people to Mars. Even if Mr. Musk’s announcements become too optimistic, the future of space exploration will not …

Sen. Ted Cruz (R-TX) and other right-leaning critics called on MSNBC medical analyst Dr. Vin Gupta, when he told viewers that even after receiving the Covid-19 vaccine, they should wear masks and avoid traveling at least until the summer. “You’re vaccinated with that second dose, it doesn’t mean you have …

In Sweden, where a nationwide lockdown has never been imposed, with a total of 7,700 coronavirus deaths, calls for contact lockdowns and stricter measures are on the rise among health officials. The country’s seven-day death average has been rising sharply since the end of October, before sinking in recent days …

MIT and Harvard researchers have studied how the initial units of magnetism, called spins (black arrows), revolve around a chain of atoms (colored spheres) and interact with other spins. The background blue (spin up) shows the real image of the spin by displaying the high contrast periodic modulation of the …