Nature documentaries always go on and on about how fast a cheetah can run. Cats in captivity have been clocked at 65 miles an hour, the highest speed recorded for any land animal.
And yet, scientists know very little about how the animal runs in the wild, especially when on the hunt.
"You can look at it and say, 'Oh that's fast,' " says Alan Wilson, a veterinarian at the Royal Veterinary College, London. "But you can't actually describe what route it follows, or how quickly it's gone, or the details of [the] forces it has to exert to do that."
Of all the violent cities of Latin America, one stands out as a great success story: Medellin, a metropolis nestled in the mountains of northwest Colombia.
Once the home of the cocaine kingpin Pablo Escobar, it recorded more than 6,300 homicides in 1991, making it the world's murder capital. Then, one city government after another built schools and libraries, parks and infrastructure. The police also received an overhaul and became more adept at going after violent trafficking groups.
Good morning. I'm Renee Montagne. A flight from Las Vegas to Phoenix this week was delayed and delayed, passengers stuck on the tarmac for four hours without air conditioning or water in 108-degree heat. A YouTube post said some passengers got sick, but, quote, to "avoid a mutiny," others joined together in song: R. Kelly's "I Believe I Can Fly."
UNIDENTIFIED GROUP: (Singing) I believe I can fly.