Armed policeman guards Number 10 Downing Street, official home of the British Prime Minister, London, UK

Armed policeman guards Number 10 Downing Street, official home of the British Prime Minister, London, UK

Policeman watches red carpet being laid outside number 10 Downing Street, the home of the Prime Minister, London, UK.

Tram number 28 in Alfama, Lisbon, Portugal, Europe

Weltzeituhr (world clock) and Hotel Park Inn, Alexanderplatz Square, Berlin Mitte, Berlin, Germany, Europe

Trams (cable car), San Francisco, California, United States of America, North America

View of beginning of Route 66, Downtown Chicago, Illinois, United States of America, North America

A number 28 tram runs along the scenic route popular with tourists in the Alfama district of Lisbon, Portugal, Europe

Yachts and power boats moored in the Marina at St Vaast la Hougue channel port in Normandy, France

Spring blossom and red narrow boat reflected in tranquil River Thames, Oxfordshire, England, United Kingdom, Europe

Trams, San Francisco, California, United States of America, North America

Yachts and power boats moored in the Marina at St Vaast la Hougue channel port in Normandy, France

Number 10 Downing Street, official home of the British Prime Minister, London, United Kingdom

Large number of pumpkins for sale on a farm in St. Joseph, Missouri, United States of America, North America

The shoe last factory, Fagus Factory, UNESCO World Heritage Site, Lower Saxony, Germany, Europe

Art Deco Building, Napier, Hawkes Bay, North Island, New Zealand, Pacific

Red narrow boat passes under Shillingford Bridge reflected in River Thames, Shillingford, Oxfordshire, England, United Kingdom, Europe

Still life of a small number of yellow gourds in a rustic wicker basket

Number 3 outside a French house at St Germain Des Vaux in Normandy, France

Trams (cable car), San Francisco, California, United States of America, North America

Close-up of front radiator, number plate and lamps on a Citroen 4CV in France, Europe

Marrion Square, House number 29, Dublin, Republic of Ireland, Europe

View of vintage station wagon and Mr D'z Diner on Route 66 in Kingman, Arizona, United States of America, North America

A single shell among sea-washed stones on a beach in Normandy, France

Close-up of a number of red strawberries in Kent, England, United Kingdom, Europe

Shipbreakers #01. EPOTY 2012 entry. In Chittagong, Bangladesh, is the world's largest marine cemetery. Hundreds of ships annually go to these shores, where a huge number of workers, day by day, working by hand scrapping these huge masses of metal, all without gloves, barefoot and without health insurance.

Sheep and lambs in a field in Kirkoswold, Eden Valley, Cumbria, UK.

Wildfire damage in Yosemite National Park, California, USA. Most of California is in exceptional drought, the highest classification of drought, which has lead to an increasing number of wild fires.

Wildfire damage in Yosemite National Park, California, USA. Most of California is in exceptional drought, the highest classification of drought, which has lead to an increasing number of wild fires.

Wildfire damage in Yosemite National Park, California, USA. Most of California is in exceptional drought, the highest classification of drought, which has lead to an increasing number of wild fires.

Plaza San Juan de Dios, Camaguey, Region of Camaguey, Cuba, Central America

Education, pakistan. Punjab. Maths class using traditional methods in a primary state school

French Metal Milk Jugs

A pousse-pousse in the street in Antsirabe, a town renowned for the number of rickshaws, Madagascar, Africa

Sheep and lambs in a field in Kirkoswold, Eden Valley, Cumbria, UK.

Hof number 1 of the Hackeschen Hofe, Mitte District, East Berlin, Germany, Europe

Photo class participant Douglas Wilcox taking images in the Galapagos Island Archipeligo, Ecuador. Model release number DW0507.

Canadian photographer Gilles Pucheu at work near his home in Yellowknife, Northwest Territories, Canada. MORE INFO Model release number GP032810.

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

Canadian photographer Marianne Pucheu in Arctic clothing near her home in Yellowknife, Northwest Territories, Canada. MORE INFO Model release number MP032810.

Canadian photographer Gilles Pucheu at work near his home in Yellowknife, Northwest Territories, Canada. MORE INFO Model release number GP032810.

Humpback whale calf (Megaptera novaeangliae) breaching in south Frederick Sound, Southeast Alaska, USA. Pacific Ocean. Note the high number of barnacles on this calf's head and rostrum.

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

Flying Squid Species in mid-air (Ommastrephes bartramii). Extremely rare unusual image. South Atlantic Ocean. MORE INFO: Flying Squid use membranes between their tentacles (visible on pic) & two fins at the rear of the mantle to glide through the air in a similar way to flying fish. These unique adaptations allow them to avoid predation more easily. Ommastrephid squids are among the strongest swimmers in the Cephalopoda. A number of species are fished commercially. This particular species (Ommastrephes bartramii), is commonly known as "Neon Flying Squid" due to its colouration and its ability to glide over the ocean surface as seen in the photographs. Please note that this is a genuine image of a wild animal in its natural environment. It is not a digital manipulation.

Flying Squid Species in mid-air (Ommastrephes bartramii). Extremely rare unusual image. South Atlantic Ocean. MORE INFO: Flying Squid use membranes between their tentacles (visible on pic) & two fins at the rear of the mantle to glide through the air in a similar way to flying fish. These unique adaptations allow them to avoid predation more easily. Ommastrephid squids are among the strongest swimmers in the Cephalopoda. A number of species are fished commercially. This particular species (Ommastrephes bartramii), is commonly known as "Neon Flying Squid" due to its colouration and its ability to glide over the ocean surface as seen in the photographs. Please note that this is a genuine image of a wild animal in its natural environment. It is not a digital manipulation.

Flying Squid Species in mid-air (Ommastrephes bartramii). Extremely rare unusual image. South Atlantic Ocean. MORE INFO: Flying Squid use membranes between their tentacles (visible on pic) & two fins at the rear of the mantle to glide through the air in a similar way to flying fish. These unique adaptations allow them to avoid predation more easily. Ommastrephid squids are among the strongest swimmers in the Cephalopoda. A number of species are fished commercially. This particular species (Ommastrephes bartramii), is commonly known as "Neon Flying Squid" due to its colouration and its ability to glide over the ocean surface as seen in the photographs. Please note that this is a genuine image of a wild animal in its natural environment. It is not a digital manipulation.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Orkney Islands Sept 2011 Wave and Tidal Power shoot - The Pelamis Wave Power machine in Orkney - alongside in Lyness - the machine is the P2 . The Pelamis absorbs the energy of ocean waves and converts it into electricity. The machine floats semi-submerged on the surface of the water and is made up of a number of cylindrical sections joined together by hinged joints. As waves pass down the length of the machine these sections flex relative to one another. The motion at each hinged joint is resisted by hydraulic cylinders which pump fluid into high pressure accumulators allowing electrical generation to be smooth and continuous. Control of the resistance applied by the hydraulic cylinders allows generation to be maximised when waves are small, and the machine response to be minimised in storms. All generation systems are sealed and dry inside the machines and power is transmitted to shore using standard subsea cables and equipment.

Canadian photographer Gilles Pucheu at work near his home in Yellowknife, Northwest Territories, Canada. MORE INFO Model release number GP032810.

Humpback whale calf (Megaptera novaeangliae) breaching in south Frederick Sound, Southeast Alaska, USA. Pacific Ocean. Note the high number of barnacles on this calf's head and rostrum.

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

A sudoku puzzle

Staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Galapagos Islands, Ecuador. Model release number JD0509.

The Beltana number 1 mine, an open cast or drift coal mine managed by Xstrata coal in the Hunter Valley, New South Wales, Australia, Pacific

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

Lindblad Expeditions Guests doing fun and exciting things in the Galapagos Island Archipeligo, Ecuador. Model release number SMB0509.

The Beltana number 1 mine, an open cast or drift coal mine managed by Xstrata coal in the Hunter Valley, New South Wales, Australia, Pacific

Canadian photographer Gilles Pucheu at work near his home in Yellowknife, Northwest Territories, Canada. MORE INFO Model release number GP032810.

Humpback whale calf (Megaptera novaeangliae) breaching in south Frederick Sound, Southeast Alaska, USA. Pacific Ocean. Note the high number of barnacles on this calf's head and rostrum.

Common dolphin (Delphinus delphis) showing a large number of rake marks on its back inflicted by the teeth of other common dolphins. Hebrides, West coast of Scotland.

Humpback whale calf (Megaptera novaeangliae) breaching in south Frederick Sound, Southeast Alaska, USA. Pacific Ocean. Note the high number of barnacles on this calf's head and rostrum.

The Beltana number 1 mine, an open cast or drift coal mine managed by Xstrata coal in the Hunter Valley, New South Wales, Australia, Pacific

The Beltana number 1 mine, an open cast or drift coal mine managed by Xstrata coal in the Hunter Valley, New South Wales, Australia, Pacific

Runners in the Windermere Marathon in the Lake District, Cumbria, England, United Kingdom, Europe

A post box for a house on a road near Fairbanks, Alaska, United States of America, North America

Humpback whale calf (Megaptera novaeangliae) breaching in south Frederick Sound, Southeast Alaska, USA. Pacific Ocean. Note the high number of barnacles on this calf's head and rostrum.

Humpback whale calf (Megaptera novaeangliae) breaching in south Frederick Sound, Southeast Alaska, USA. Pacific Ocean. Note the high number of barnacles on this calf's head and rostrum.

Humpback whale calf (Megaptera novaeangliae) breaching in south Frederick Sound, Southeast Alaska, USA. Pacific Ocean. Note the high number of barnacles on this calf's head and rostrum.

The Beltana number 1 mine, an open cast or drift coal mine managed by Xstrata coal in the Hunter Valley, New South Wales, Australia, Pacific

Bus in a bus lane in Carlisle, Cumbria, England, United Kingdom, Europe

Mixed race woman gesturing peace in gallery

Person wearing mask in smoke

Number 15 on cake

Caucasian man doing push-ups on running track

Caucasian man doing push-ups on running track

Number 15 on cake near letter J

Close up of business newspaper with stocks

Cake on tray with number 90

African girl holding addition flash cards

Caucasian man jumping rope on running track

Number 5 at baccarat table

Number 7 at baccarat table

Close up of hotel telephone

Portrait of friends wearing shirts with number 42

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Aerial view of Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. Red lagoon near Boca Paila Bridge. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

Palms and old pier in Punta Allen Sian Ka'an Reserve, Yucatan Peninsula, Mexico. In the language of the Mayan peoples who once inhabited this region, Sian Ka'an means Origin of the Sky. Located on the east coast of the Yucatán peninsula, this biosphere reserve contains tropical forests, mangroves and marshes, as well as a large marine section intersected by a barrier reef. It provides a habitat for a remarkably rich flora and a fauna comprising more than 300 species of birds, as well as a large number of the region's characteristic terrestrial vertebrates, which cohabit in the diverse environment formed by its complex hydrological system. Along its roughly 120 kilometres of coastline, the property covers over 400,000 hectares of land ranging from sea level to only ten m.a.s.l. The property boasts diverse tropical forests, palm savannah, one of the most pristine wetlands in the region, lagoons, extensive mangrove stands, as well as sandy beaches and dunes. The 120,000 hectares of marine area protect a valuable part of the Mesoamerican Barrier Reef and seagrass beds in the shallow bays. The lush green of the forests and the many shades of blue of the lagoons and the Caribbean Sea under a wide sky offer fascinating visual impressions.

stairs to platform number 5, Railway station of Kyoto,Japan.

Acetaminophen Tablet

Earth's yearly radiation budget

Pluto and the Kuiper belt

Rising air in an unstable atmosphere