The science of light and how it moves, optics, A statement that makes something easy to understand, explanation, To control or keep something working in the best way, regulate, To add or give something extra, contribute, To suggest something for people to decide on, propose, Not easy or sensible to do, impractical

3RD-U6-L7

by
Print
Embed

Leaderboard

We are currently working on improving the Leaderboard functionality. Please help us by offering your feedback.

Give Feedback

Visual style

Options

We are currently working on improving the Activity Settings. Please help us by offering your feedback.

Give Feedback

Switch template

Continue editing: ?