And though ingredients and toppings vary widely from one salad to another, the base ingredient they all have in common is some form of lettuce. Here's which types of lettuce are most popular ...

Farmers growing lettuce prefer varieties that are resistant ... we can track how a disease develops in a living plant in real ...

The consistent use of lettuce across different cultures suggests that its sleep-promoting benefits were not merely based on folklore but on real physiological effects. Modern research has ...