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Have you ever hiked up a mountain and thought, “Man, I wish I could just ride a bike back down?”

The German company Ortovox has granted that wish with its Mountain Skyver Trail bike. It’s actually more of a bike/scooter hybrid — it has front and rear disc brakes and full suspension like a mountain bike, but no seat, gears, chain or pedals. It folds up and fits into a specialized backpack, allowing you to hike up a trail and ride back down.

Packing it up the Skyver a quick, tool-free affair. Detach the 20-inch front wheel...

Copies of two Doctor Who episodes from the 1960s that were presumed lost forever were found recently in the library of a private collector.

Terry Burnett, a former television engineer, bought recordings of the episodes in the 1980s at a school festival in Hampshire, England. Both episodes were segments from four-part stories: “Air Lock” was the third installment in 1965’s Galaxy 4; the second recovered episode was “Episode 2? of 1967’s The Underwater Menace.

Burnett wasn’t aware the episodes were missing, but their recovery became a major announcement Sunday within the Doctor Who universe as...