The next time you see a tree stump take a closer look at its rings. Every year most trees produce a light-coloured ring of spring growth and a dark-coloured ring of summer growth. If you count only one ring not both rings, you will be able to tell how old the tree was when it was cut down.
Big cats
Big cats An almost complete skeleton of a huge
sabre-toothed cat named "Xenosmilus" has been dug up in a Florida
quarry. This animal roamed the south-east corner of North America
in the Early Pleistocene. Two other kinds of sabre-tooth cat are
known in North America, one short-legged with long teeth and one
long-legged with short teeth. This newest fossil combines traits
from both of these other cats. Scientists say that the cat would
have had a bear-like appearance. 29 JANUARY 2000, P. 21
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