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Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

Vaccine progress is stalling.

That's the message from a new report issued by the World Health Organization and UNICEF.

The report focuses on the DTP vaccine — the essential vaccine that protects kids against diphtheria, tetanus and pertussis (whooping cough) and that was first licensed in 1949.

A summer hike up to a 13,000-foot alpine meadow can be exhilarating. However the lack of oxygen, frigid temperatures and sparse vegetation would make long-term survival difficult. Archaeologists know hunter-gatherers traversed highland areas thousands of years ago, but presumed they had to spend most of their time in lowland areas.

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