Spiders that hunt at night often have a special layer at the back of their big eyes. It acts like a mirror to bounce light back into the eyes. On a dark night, this reflected light makes the spider's eyes seem to glow!
Ancient stone tools chip away date of early humans'
arrival
Ancient stone tools chip away date of early humans'
arrival In Alberta, archaeologist Dr Jiri Chlachula has
discovered stone tools believed to have been made at least 20,000
years ago, predating the last Ice Age. The tools were found near
the Bow River in Calgary, in 1990. More recent finds have been made
by Dr. Chlachula and his colleagues in several other locations. Dr
Chlachula believes that there are probably many more artifacts
buried under glacial debris throughout the region. It had
previously been believed that humans did not come to this part of
North America until about 12,000 years ago. These new findings
could shed light on how and when ancient humans migrated south
through North America. There is some disagreement over whether the
tools found do actually predate the Ice Age. However, sites
containing tools and other artifacts have been found by other
scientists, which lends more support to the theory that humans had
migrated south before the Ice Age. 16 JANUARY 1999
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