New Immigrants and Old. Americans at the turn of the century were alarmed about what they perceived as a change in the type of immigrants entering the United States. Some of the traits they saw as distinguishing the new immigrants from the old immigrants were real; some were imagined; some were half-true. The old immigration peaked in the 1880s. The new immigration peaked in 1907.
It is absolutely OK to filter and reuse deep-fry oil. It's not uncommon at some short-order restaurants for them to filter the oil daily and only change it once a week. Of course, it does start to taste a little off when you reuse it that many times.
If you refrigerate an oil, its shelf life will increase. If you have a large amount, you can freeze the rest of it if you know you will not use it for a while. We highly recommend either refrigerating or freezing what you will not use right away. The important thing is to keep the oil out of light, air and heat.