And,the professor suspects that early humans liked ivory flutes more because the instruments produced a deeper,richer sound.

VOA: special.2009.08.18

In his research paper, Hubble said the issue could be decided only by more powerful instruments.

VOA: special.2009.04.29

The telescope recently received new equipment and instruments to make it even more powerful.

VOA: special.2009.09.30

Then he added more musicians and instruments from other countries.

VOA: special.2009.07.31