This keeps food and drink cold

Coolers keep your food and beverages cold in two ways: either with ice to bring the temperature down, and/or through insulation to keep the temperature down. The Good Housekeeping Institute regularly tests coolers by recording how long each model stays cold within a controlled setting that mimics real-life environments.

b

explanation:

to me i think class room sitting education is better. i do online school and i have not learned a think haha. when i sit in the classroom i just sit there and kind of pay attention but still i get so far ahead in the class when im doing online i have nothing else better to do but play video games and i sit in school and learn and have friends and just actually learn. when i'm doing online i sit here listing to music and get on and and look up the answers i guess that is my fault for being a cheater. but to be honest i think sitting in the classroom is better.