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Humans

From the August 22, 1936, issue

Hummingbirds in flight, a cosmic-ray detector, and rare metals in meteorites.

Humans

ThinkQuest Winners

In the ThinkQuest competition, teams of students from around the world create educational Web sites. Take a look at this year’s winners, which feature imaginative and engaging efforts on such topics as avian flu, mathematics history, information inequality in the digital age, minerals and mining, artificial intelligence, and more. Go to: http://www.thinkquest.org/aug05may06/index.shtml

Earth

Mercury Rising: Natural wildfires release pollutant

Fires in high-latitude forests and peaty soils of the Northern Hemisphere may loft hundreds of tons of mercury into the atmosphere each year.