Einstein
a famous scientist
Einstein was a great scientist.
prodigy
a very smart or talented child
He is a music prodigy.
observant
good at noticing small things
She is very observant.
tremble
to shake a little
I tremble when I am cold.
invisible
cannot be seen
Air is invisible.
force
a power that pulls or pushes
mechanism
how something works inside
exceptionally
very, very much
He is exceptionally smart.
needle
the moving arrow in a compass
The needle points north.
rotate
to turn around