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.
Dinosaur killer found entrapped
Dinosaur killer found entrapped Scientists have discovered gases that come from
outer space trapped in tiny carbon molecules that were deposited on
Earth 65 million years ago when an asteroid struck the planet. This
disaster helped to doom the dinosaurs. The space gases were found
when researchers from the University of Hawaii, the University of
Rochester and NASA examined the tiny carbon molecules, known as
"buckyballs", found in sediments around the globe that were formed
after the asteroid impact. These small carbon molecules take
various geometric shapes and gases that are not normally found on
Earth were trapped inside them. This shows that tiny carbon
molecules like buckyballs can carry extraterrestrial substances to
Earth. 6 APRIL 2000
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