A smiling face carved in stone, Bayon, Angkor, UNESCO World Heritage Site, Siem Reap, Cambodia, Indochina, Southeast Asia, Asia

Portrait of a girl of Indian ethnicity at a Hindu Festival in Georgetown, Guyana, South America

Group of girls sitting on the beach of a lake

Group of girls splashing each other and playing in a lake

Girl lying on a sofa holding an iPad, tablet computer with wireless internet access

Group of girls playing with a ball on the beach of a lake

Woman and two children at Seljalandsfoss, Iceland, Europe

Group of girls playing with a ball on the beach of a lake

Two men in traditional Bavarian dress, Lederhose, on a meadow

Girlfriends lying on the beach of a lake

Two girls sitting on a couch, one is listening with earphones to music from an iPad, tablet computer, one is playing with an iPhone, smartphone

Girlfriends sitting on the beach of a lake

Group of girls playing with a ball on the beach of a lake

Group of girls splashing each other and playing in a lake

Group of girls playing with a ball on the beach of a lake

Group of girls playing with a ball on the beach of a lake

Three friends, one girl and two boys, arm in arm

Mother on holiday carrying the suitcases for her family on her own on the beach

Girls, portrait, Cameroon, Africa

Girl lying on a couch and reading a magazine

Gullfoss, The Golden Waterfall, Iceland, Europe

Liu Chunnan, 22, with her 10 day old baby in a camp for people whose homes were destroyed in the Sichuan earthquake. 5/15/2008

Family with three children (6-7, 10-11, 14-15) running on beach, Laguna Beach, California

Portrait of family with three children (6-7, 10-11, 14-15) with surfboards on beach, Laguna Beach, California

USA, California, Orange County, Group of children (12-17 months, 2-3, 6-7, 10-11, 12-13, 14-15) posing in garden

Family with three children (6-7, 10-11, 14-15) cooking marshmallows, Laguna Beach, California

Father on beach with his three sons (6-7, 10-11, 14-15), Laguna Beach, California

Father on beach with his three sons (6-7, 10-11, 14-15), Laguna Beach, California

Portrait of family with three children (6-7, 10-11, 14-15) with surfboards on beach, Laguna Beach, California

Boys (6-7, 10-11, 14-15) waxing surfboard at sunset, Laguna Beach, California

Girls (10-11, 12-13, 14-15) walking on stepping stones in lake at sunrise

Son with three sons (6-7, 10-11, 14-15) sitting on beach, Laguna Beach, California

Father playing football on beach with his three sons (6-7, 10-11, 14-15), Laguna Beach, California

Portrait of family with three children (6-7, 10-11, 14-15) cooking marshmallows, Laguna Beach, California

Portrait of brothers (6-7, 10-11, 14-15) on beach, Laguna Beach, California

Man talking with his sons (10-11, 14-15) by campfire, Laguna Beach, California

Family with three children (6-7, 10-11, 14-15) running on beach, Laguna Beach, California

Family with three children (6-7, 10-11, 14-15) talking on beach, Laguna Beach, California

Portrait of family with three children (6-7, 10-11, 14-15) on vacation, Laguna Beach, California

Family with three children (6-7, 10-11, 14-15) sitting on beach, Laguna Beach, California

Father playing football on beach with his three sons (6-7, 10-11, 14-15), Laguna Beach, California

Family with three children (6-7, 10-11, 14-15) with surfboards on beach, Laguna Beach, California

Portrait of smiling family with children (6-7, 10-11, 14-15) on beach, Laguna Beach, California

Portrait of family with three children (6-7, 10-11, 14-15) with surfboards on beach, Laguna Beach, California

Father playing football on beach with his three sons (6-7, 10-11, 14-15), Laguna Beach, California

Portrait of happy family with three children (6-7, 10-11, 14-15) on beach, Laguna Beach, California

Portrait of with three children (6-7, 10-11, 14-15) on vacation

Parents skateboarding with their children (6-7, 10-11, 14-15), Laguna Beach, California

Family with three children (6-7, 10-11, 14-15) sitting on beach, Laguna Beach, California

Family with three children (6-7, 10-11, 14-15) looking at sea, Laguna Beach, California

Portrait of family with three children (6-7, 10-11, 14-15) with surfboards on beach, Laguna Beach, California

Father playing with his sons (6-7, 10-11, 14-15) on beach, Laguna Beach, California

Snorkeler photographing a pod of Sleeping sperm whale (Physeter macrocephalus) Researchers first saw this unusual sleep behavior in sperm whales in 2008. The scientists in that study found that sperm whales dozed in this upright drifting posture for about 10 to 15 minutes at a time, Vulnerable (IUCN). The sperm whale is the largest of the toothed whales. Sperm whales are known to dive as deep as 1,000 meters in search of squid to eat. Dominica, Caribbean Sea, Atlantic Ocean. Photo taken under permit n°RP 16-02/32 FIS-5.

Pod of Sleeping sperm whale (Physeter macrocephalus) Researchers first saw this unusual sleep behavior in sperm whales in 2008. The scientists in that study found that sperm whales dozed in this upright drifting posture for about 10 to 15 minutes at a time, Vulnerable (IUCN). The sperm whale is the largest of the toothed whales. Sperm whales are known to dive as deep as 1,000 meters in search of squid to eat. Dominica, Caribbean Sea, Atlantic Ocean. Photo taken under permit n°RP 16-02/32 FIS-5.

Free diver is swimming over a pod of Sleeping sperm whale (Physeter macrocephalus) Researchers first saw this unusual sleep behavior in sperm whales in 2008. The scientists in that study found that sperm whales dozed in this upright drifting posture for about 10 to 15 minutes at a time, Vulnerable (IUCN). The sperm whale is the largest of the toothed whales. Sperm whales are known to dive as deep as 1,000 meters in search of squid to eat. Dominica, Caribbean Sea, Atlantic Ocean. Photo taken under permit n°RP 16-02/32 FIS-5.

Pod of sperm whale relaxing after a short sleep (Physeter macrocephalus) Researchers first saw this unusual sleep behavior in sperm whales in 2008. The scientists in that study found that sperm whales dozed in this upright drifting posture for about 10 to 15 minutes at a time, Vulnerable (IUCN). The sperm whale is the largest of the toothed whales. Sperm whales are known to dive as deep as 1,000 meters in search of squid to eat. Dominica, Caribbean Sea, Atlantic Ocean. Photo taken under permit n°RP 16-02/32 FIS-5.

Pod of Sleeping sperm whale (Physeter macrocephalus) Researchers first saw this unusual sleep behavior in sperm whales in 2008. The scientists in that study found that sperm whales dozed in this upright drifting posture for about 10 to 15 minutes at a time, Vulnerable (IUCN). The sperm whale is the largest of the toothed whales. Sperm whales are known to dive as deep as 1,000 meters in search of squid to eat. Dominica, Caribbean Sea, Atlantic Ocean. Photo taken under permit n°RP 16-02/32 FIS-5.