puzzled

The question of cooperation has puzzled scientists for a long time.

Astronomers say they are close to solving an intergalactic mystery about the creation of the universe's biggest galaxies which has puzzled experts for decades.

The fact that none of the animals are reported to be infected with the virus has both puzzled and concerned public health experts.

Last September, scientists around the world were puzzled by an unusual rumbling traveling through the Earth.

One certainly hopes they are wrong, and voters will continue to be puzzled as to why they're being told to be scared about the personal business of strangers.