Science

FDA OKs mixing COVID vaccines; backs Moderna, J and J boosters
U.S. regulators are extending COVID-19 boosters to Americans who got the Moderna or Johnson & Johnson vaccine. They also said Wednesday anyone eligible for an extra dose can get a brand different from the one they received initially.
From Minnesota to Mexico: How do monarchs know where and when to go?
Monarch butterflies, Minnesota’s official state butterfly, spend their summer throughout the Midwest and migrate to Mexico in the fall to avoid the freezing winters. Most have already embarked on their more than 2,500-mile trek south to the sacred pine forests of central Mexico. Hear more about their journey.
NASA's asteroid hunter Lucy soars into sky with diamonds
A NASA spacecraft named Lucy has rocketed into the sky with diamonds on a 12-year quest to explore a record-setting eight asteroids. The rocket is sending Lucy on a roundabout journey to the Trojan asteroids near Jupiter. 
William Shatner, TV's Capt. Kirk, blasts into space
William Shatner, 90, became the oldest person to fly into space, according to Blue Origin. The company, owned by billionaire Jeff Bezos, launched its first human spaceflight in July.
Next on FDA's agenda: Booster shots of Moderna, J and J vaccines
With many Americans who got Pfizer vaccinations already rolling up their sleeves for a booster shot, millions of others who received the Moderna or Johnson & Johnson vaccine wait anxiously to learn when it's their turn.
Fat Bear Week has a champion: All hail 480 Otis
Who is the fattest bear of all? For the fourth time, the answer is 480 Otis, a brown bear who didn't let his lack of two canine teeth stop him from packing on the pounds.
Nobel in chemistry honors pair for way to build molecules
Benjamin List of Germany and Scotland-born David W.C. MacMillan developed “asymmetric organocatalysis” — work that has already had a significant impact on pharmaceutical research, said Goran Hansson, secretary-general of the Royal Swedish Academy of Sciences. The tool has also made chemistry “greener,” the judges said.