HTwins.net

HTwins.net (Huang Twins.net) is a website created by Michael and Cary Huang, the creators of Battle for Dream Island. It contains multiple games and features, including GTTTATINT (Get To The Top Although There Is No Top!), BFDIA 5b, Racing extreme, Tidepool, Scale of the universe 2 and other stuff like theirearly animations before they started making Battle for Dream Island.

Interactivities
These are the interactivites used as science, and math.

The Scale of the Universe
The Scale of the Universe differs into 2 modes, the old vesion and the new version.

On The Scale of the Universe 2, the activity has more objects on Quantum Foam thru the Universe. The meter we start on is the meter (10^0 meters). Otherwise, the scroll on the bottom is not directly on the center. There might be little amounts of objects that are bigger than a meter, and many objects/atoms prior than a meter.

Trivia

 * According to her doodle on the test in Are You Smarter Than a Snowball?, Pencil likes going on HTwins.net.
 * The Scale of the Universe 2 was once featured on two Vsauce videos.
 * A prototype of the website from June 2009 is available at http://htwins.net/new.