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What is "sink"?
go down to the bottom
What is "float"?
to stay on the surface of a liquid and not sink:
What is "unsinkable"?
stay afloat
What is "repel"?
not allow a substance to be absorbed into it
What is "pattern"?
a particular way in which something is done
What is "bob"?
move up and down quickly
Who have figured out the unsinkable metal?
scientists from New York
What animals can float on water?
ants and spiders
Why can some ants and spiders float on water?
their bodies repel water or push it away; they can trap the air bubbles
What did the scientists change to make metal unsinkable?
surface
How did the scientist change the surface of metal?
use lasers to make tiny patterns on the surface that trap air and repel water
What is "droplet"?
a small drop of liquid
Can the metal float with punched holes on it?
Yes
