Uranus and Neptune are made primarily of hydrogen compounds, with smaller traces of hydrogen, helium, metal and rock. The most common hydrogen compounds are methane (CH4), ammonia (NH3), and water (H2O). The farther away a planet is from the Sun, the cooler its atmosphere will be.
Musical.ly is a popular app for creating 15-second music videos. How it works is kids select snippets of popular songs and record themselves singing, lip-syncing or dancing. Some kids skip the music and perform 15-second comedy skits.
As of July 2016, musical.ly has over 90 million registered users and an average of 12 million new videos posted every day. musical.ly is headquartered in Shanghai, China and has offices in San Francisco, California.