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On March 31, 1989, a UFO was spotted in the sky over London, England. The flying saucer attracted hundreds of witnesses who may have wondered if extraterrestrials were about to land on Earth. But this was no alien invasion. It was the ultimate April Fools’ joke.

The man behind the prank was Richard Branson, the founder of the Virgin Group. Branson’s company is involved with entertainment, fitness, and flight—but business isn’t Branson’s only interest. He’s all about April Fools’ Day, which falls every year on April 1.

For his legendary 1989 stunt, Branson didn’t build a flying saucer from scratch. Instead, he made a hot air balloon look like a flying saucer by covering it in silver casing and adding lights that could flash on and off. The dressed-up balloon took flight early in the morning, just as the sun was rising and the first commuters were heading to work. At least some of the people who saw the eerie “UFO” hovering over them took it pretty seriously. The police later said they lost count of the number of calls they received.

The police pursued the mysterious “spacecraft” and finally caught up with it just after it landed. But, as Branson later remembered, the drama didn’t end there. When the door of the flying saucer opened, Branson recalled, fog wafted out and an alien emerged. (Of course, it was a human wearing an alien costume.) Since the next day would be April Fools’, the police soon realized what was going on.

Branson’s company, Virgin Group, has since gotten involved in space exploration. Maybe Branson will actually be an alien someday—exploring a planet far from Earth.

For more than 100 years, a ship called the Endurance was hidden under the icy waters near Antarctica. Now, the ship has been found. And it looks a lot like it did a century ago.

The Endurance was part of an expedition led by British explorer Ernest Shackleton. In August 1914, Shackleton and his crew set out to make the first land crossing of Antarctica. But trying to reach the frozen continent would almost prove to be deadly. In December, the Endurance became trapped in the ice-covered Weddell Sea. The ship drifted for 10 months before it got crushed by pack ice. For five more months, the crew camped on ice floes before escaping in lifeboats to a nearby island. By then, the Endurance had sunk into the sea.

On March 5, 2022, a team of researchers located the Endurance nearly 10,000 feet (3,008 meters) under water. It wasn’t easy. The team had to use a ship that’s designed to break through the ice that covers the Weddell Sea. They sent remote submarines under the water to search for the ship. It took more than two weeks to find the Endurance. No sunlight reaches the seafloor, making the environment extremely cold and dark.

But the cold water proved to be a very good thing. It kept the Endurance in remarkably good shape. Scientists say wood-eating worms often eat away at shipwrecks. But these worms can’t survive at the bottom of the freezing Weddell Sea. So the Endurance still looks a lot like it did during Shackleton’s lifetime.

Viewing photos of the ship is almost like going back in time.