Given the 4 pairs of nutrition labels below, match each pair to the options listed on the next page. Write the appropriate letter (a-h) in the spaces provided.
 More...

This year, 2015, is the International Year of Light. Here are some questions regarding the nature of light.a) The two pictures below were each taken with the same automatic single-exposure digital camera and with the same interior lighting. The pictures were taken from the same position facing a window, one hour apart from each other, in early January. What observations can you make? What explanations can you give? Check all boxes next to correct statements  More...