You see them everywhere on TikTok and Instagram. Social media influencers share products and document lavish travel. They may offer advice about investing and share their favorite apps for trading stocks. Perhaps your favorite “finfluencer” has a budget tracker you can buy. 　　But what is an influencer, and how does influencer marketing work? Whether you’re looking to earn a...

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As the sun dips below the horizon and the light starts to dim, lucky observers may spot a rare, brief flash of emerald. This is the green flash, which can sometimes be seen right after sunset or before sunrise. So what causes the green flash? Like many colorful spectacles in the sky, such as rainbows, the green flash is the...

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　　McMurdo Station, research and logistics installation located on the Hut Point Peninsula, on Ross Island, Antarctica. Operated by the National Science Foundation (NSF) with the assistance of the U.S. military, the station is the largest town in Antarctica and the continent’s largest research station. It sits near the foot of Mount Erebus and occupies the southernmost point of solid ground...

Quick factsWhere is it? Central Mali, Africa. What's in the photo? A massive, jellyfish-shaped thunderstorm cloud. Which satellite took the photo? Suomi National Polar-orbiting Partnership (Suomi NPP). When was it taken? Sept. 27, 2018. This striking photo shows an extremely unusual thunderstorm cloud in the shape of a jellyfish floating above western Africa. The oddly shaped cloud, which was roughly...

　　In full: Kniaz Potemkin Tavricheskiy (Show more) Potemkin (Russian battleship), Russian battleship built for the Black Sea fleet of the Imperial Russian Navy. It is best remembered for a 1905 mutiny by its sailors, one of the events of the Russian Revolution in the same year. The mutineers took the ship to Odesa, Ukraine, but the mutiny eventually failed. The...

QUICK FACTSName: Snake Island Location: Atlantic Ocean off the coast of So Paulo state, Brazil Coordinates: -24.484043070527676, -46.67561478998516 Why it's incredible: The island is so dangerous, only the Brazilian navy and scientists with special permits are allowed access. Snake Island is a small, forested island off the coast of Brazil that writhes with thousands of venomous vipers. The snakes, which...

　　 　　Fiduciary. It sounds official, doesn’t it? Like those 19th century bankers in their three-piece suits and bowler hats. In a way, that’s not far off—minus the hats. 　　In general, a fiduciary is a person or organization who acts on behalf of others. A fiduciary can be a professional like an attorney, an accountant, or, very commonly, a financial advisor....

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　　Battle of San Juan Hill, the most significant U.S. land victory, and one of the final battles, of the Spanish-American War. It occurred on July 1, 1898. After the Battle of Las Guasimas in Cuba, Major General William Shafter planned to take Santiago de Cuba, the island’s second largest city. Reports of Spanish reinforcements en route to the city caused...

　　Also called: Nora Baker (Show more) Code name: Madeleine (Show more) Born: January 1, 1914, Moscow, Russia (Show more) Killed: September 13, 1944, Dachau, Germany (Show more) Noor Inayat Khan (born January 1, 1914, Moscow, Russia—killed September 13, 1944, Dachau, Germany) was a British resistance agent in Nazi-occupied France during World War II, serving in the Special Operations Executive (SOE)....