Tear lettuce leaves by hand?
The popular belief that tearing lettuce stops its edges browning is based on the theory that it damages fewer cells and limits oxidisation. There’s nothing, however, to prove it’s any less destructive than cutting the leaves with a knife. Both will turn brown at the same rate.
The best way to store fresh celery is to wrap it in aluminium foil and put it in the refrigerator it will keep for weeks.
If you wrap your celery in tin foil before placing it in the fridge it will last for weeks, and it will still be fresh and crisp when you pull it out! This also works for stored broccoli for 7 weeks wrapped in tin foil, and heads of lettuce for at least 6 weeks!!!