Science News, May 24th, 1997
During the last 2 million years, Earth has endured more than 20 Ice ages of various lengths. The standard explanation for these periodic freezes involves rhythmic variations in the planet's orbit and tilt, but this theory has come under fire in recent years from researchers studying a Nevada cave called Devils Hole (SN: 10/10/92, p. 228). Now, a team of scientists contends that their findings have exorcised the specter of Devils Hole by confirming the orbital theory.
The debate centers on the timing of the last interglacial period, the short warm spell sandwiched between the last ice age an...
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