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- Humans
It’s About Time
What’s a year? Why do we measure it in days and weeks? How do calendars differ? What’s the earliest known date? (Hint: It’s the year Egyptians invented the calendar.) Learn answers to these and other timely questions at Calendars from the Sky, a site developed in part with support from the National Institute for Standards […]
- Humans
Letters from the October 13, 2007, issue of Science News
Another idea blown . . . Conservation by America is not going to decrease global warming (“Asian Forecast: Hazy, Warmer—Clouds of pollution heat lower atmosphere,” SN: 8/4/07, p. 68). We need to imitate known global-cooling events, such as the Krakatoa volcano explosion, which spread sunlight-reflecting dust into the stratosphere in 1883.
