What are some proxy sites not blocked by lightspeed systems?

Asystematic approach to problem solving is called a (an)

The solid that is formed and usually sinks to the bottom of a solution is the

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.