Questioning is a highly effective strategy that has the potential to successfully engage students. Questioning a particular student about an aspect of a lesson prompts the attention of that student as well as most of the students in close proximity.
Food scientist Vickie Kloeris makes meals for astronauts. Vickie Kloeris' job is to feed those astronauts. As one of NASA's top food scientists, she manages the agency's food laboratory as well as the ISS's food system, making sure everyone onboard has plenty to eat and a varying menu.
MULBERRY, Florida (CNN) -- Since the 1960s, NASA has been making astronauts' food safer by irradiating it. But for many people, irradiation -- bombarding food with gamma rays from radioactive cobalt-60 to kill food contaminants -- still evokes images of food that glows in the dark.he containers are then exposed to the racks of bluish-looking cobalt-60, which stay in a protective pool of water when not in use. In the process, which takes about 20 to 30 minutes, the gamma radiation passes through the food, killing harmful bacteria and slowing decay but not leaving the food radioactive.