Holey
Hand
Each of your eyes sees the
world from a slightly different
angle. Your brain blends the
two views together to get a
more accurate picture. But
what happens when your
brain adds together two
very different pictures?TRY THIS: Hold a long
cardboard tube up to one eye.
Cover the other eye with your
hand, but keep both eyes open.
Slowly move the hand that’s
covering your eye away from
your face. Keep it against the
side of the tube.
As your brain combines
what your left eye sees with what
your right eye sees, it sees a
hole in your hand! (If you don’t
see the hole at first, try tilting
the far end of the tube inward.)
By Dougal DixonBorealopelta (^) Art by Robert Squier
Borealopelta was
discovered by a
construction worker
whose excavator bucket
hit something very hard,
different from the rock
around it. The fossil
was well preserved.
Chemicals in it even gave
scientists an idea of the
dinosaur’s coloring.
WHERE:
Alberta, Canada
HOW
LONG:
18 feet
WHAT IT
ATE:
Low plants
WHEN:
110 millionyearsago
252 201 145 66 Present
Triassic Jurassic Cretaceous Cenozoic
bohr-ee-AL-oh-PELT-ah
“northern shield”
Bony plates in the
skin of its back, like
a modern alligator
Long
spikes,
useful for
defense
Borealopelta is on display at the Royal Tyrrell
Museum of Palaeontology in Alberta, Canada.
Light-colored belly with a
darker back, a combination
that can help animals
blend in (to hide
from predators)