This South African lion looks a bit grouchy, but he was actually yawning. His yawning caused a chain reaction of yawns from every member of the pride. Are you yawning yet?
Like curtains drawn across the landscape, the walls of the Toad River Valley yield to untracked forests and pure lakes in northeastern British Columbia. Years of compromise and careful planning defined the enormous Muskwa-Kechika Management Area here, where competing interests—from miners to outfitters, preservationists, and native peoples—coexist in delicate balance.
Reclining on a rooftop carved two millennia ago, a Bedouin surveys the realm of the Nabataeans, whose ancient capital beckons from the sands of southern Jordan. Forgotten for centuries, Petra still echoes with mysteries of the past; this immense building, Al Deir (the Monastery), was probably a Nabataean shrine.
A young polar bear leaps between drifts of Barents Sea ice in Svalbard, Norway’s Arctic archipelago. Glacial ice covers more than half of the island chain, which lies 400 miles (640 kilometers) north of the Norwegian mainland.
An Old Havana street serves as a field of dreams for young boys engaged in one of Cuba’s national passions—baseball. The island nation regularly fields one of the world’s top international teams, and many Cubans have competed in Major League Baseball. But number one fan Fidel Castro certainly isn’t among them—stories of his professional baseball prowess are pure fantasy.
Tornadoes are vertical funnels of rapidly spinning air. Their winds may top 250 miles (400 kilometers) an hour and can clear-cut a pathway a mile (1.6 kilometers) wide and 50 miles (80 kilometers) long.
Twisters are born in thunderstorms and are often accompanied by hail. Giant, persistent thunderstorms called supercells spawn the most destructive tornadoes.
These violent storms occur around the world, but the United States is a major hotspot with about a thousand tornadoes every year. "Tornado Alley," a region that includes eastern South Dakota, Nebraska, Kansas, Oklahoma, northern Texas, and eastern Colorado, is home to the most powerful and destructive of these storms. U.S. tornadoes cause 80 deaths and more than 1,500 injuries per year.
A tornado forms when changes in wind speed and direction create a horizontal spinning effect within a storm cell. This effect is then tipped vertical by rising air moving up through the thunderclouds.
The meteorological factors that drive tornadoes make them more likely at some times than at others. They occur more often in late afternoon, when thunderstorms are common, and are more prevalent in spring and summer. However, tornadoes can and do form at any time of the day and year.
Tornadoes' distinctive funnel clouds are actually transparent. They become visible when water droplets pulled from a storm's moist air condense or when dust and debris are taken up. Funnels typically grow about 660 feet (200 meters) wide.
Tornadoes move at speeds of about 10 to 20 miles (16 to 32 kilometers) per hour, although they've been clocked in bursts up to 70 miles (113 kilometers) per hour. Most don't get very far though. They rarely travel more than about six miles (ten kilometers) in their short lifetimes.
Tornadoes are classified as weak, strong, or violent storms. Violent tornadoes comprise only about two percent of all tornadoes, but they cause 70 percent of all tornado deaths and may last an hour or more.
People, cars, and even buildings may be hurled aloft by tornado-force winds—or simply blown away. Most injuries and deaths are caused by flying debris.
Tornado forecasters can't provide the same kind of warning that hurricane watchers can, but they can do enough to save lives. Today the average warning time for a tornado alert is 13 minutes. Tornadoes can also be identified by warning signs that include a dark, greenish sky, large hail, and a powerful train-like roar.
A photographer's strobe gives a violet sheen to this translucent juvenile roundbelly cowfish off the coast of Kona, Hawaii. Also known as the transparent boxfish, the roundbelly cowfish has two short horns in front of its eyes.
The borders of four nations—Saudi Arabia, Oman, Yemen, and the United Arab Emirates—blur beneath the shifting sands of the Rub al Khali, or Empty Quarter, desert.
A woman in Deshnoke, Rajasthan, watches as rats drink milk from a pan at the Karni Mata Temple, a monument to the rat goddess. More than 20,000 rats live in the temple, including a handful of white ones, which are thought to be direct descendents of Karni Mata and therefore considered especially sacred.