Assertion: disc's sound | /r/HasProperty | sagan's
Facets:
Source sentences:
text: To this they added musical selections from different cultures and eras, spoken greetings in 55 ancient and modern languages including a spoken greeting in English by U.N. Secretary-General Kurt Waldheim, other human sounds, like footsteps and laughter (Sagan's), and a printed message from U.S. president Jimmy Carter.