The edition
archive.

New tools preserve authored physics, prepare reusable robot assets, and put simulation inside the change-testing loop.

• MuJoCo makes model variants easier to preserve
• A simulation-ready asset needs its assumptions
• Put the twin inside the change-testing loop

Reusable environments make experiments easier to share. Better robot scores still need careful tests of what was learned.

• A world model, practiced on games and robot tasks
• Shared environments need clear reward rules
• A robot score needs its test conditions