Are interesting because they keep some of their light-sensitive properties and can therefore appear to be washed out over time. this condition can be reversed, however, by returning it to a dark room.
a. cyanotype
c. daguerreotypes
b. digital images
d. photogravures

Suppose that you are in a room with 3 doors and a crack in the ceiling for light. that is all. the doors each have a sign on them that says what there is behind them. door #1. a pool of corrosive acid. door #2. a crocodile that hasn't eaten in 8 months. door #3. a solar "oven". a giant lens that focuses all the sunlight at the entrance of the door. you must choose a door, which door do you choose?

Which scientist listed below is not one of those to advance the study of mathematics? a. euclid b. herodotus c. pythagoras d.archimedes

What does bts stand for? what is the importance of bts? who first started it?