Sixteenth-century author William Butler wrote this tribute to the strawberry: "Doubtless God could have made a better berry, but doubtless God never did." Red, juicy and conically shaped, the strawberry is a member of the rose family and has grown wild for centuries in both the Americas and Europe. The Romans valued the fruit for its reputed therapeutic powers for everything from loose teeth to gastritis. However, it wasn't until the late 13th century that the plant was first cultivated. The most common American variety is the result of several centuries of crossbreeding of the wild Virginia strawberry (North America's main native strawberry) and a Chilean variety.Commercial strawberry products include preserves, jams, jellies, syrups and various desserts. Strawberries are an excellent source of vitamin C and also provide some potassium and iron In physical science, freezing or solidification is the process in which a liquid turns into a solid when cold enough. The freezing point is the temperature at which this happens. Melting, the process of turning a solid to a liquid, is almost the exact opposite of freezing. All known liquids undergo freezing when the temperature is lowered enough, with the sole exception of liquid helium, which remains liquid at absolute zero and can only be solidified under pressure. For most substances, the melting and freezing points are the same temperature, however, certain substances possess differing solid-liquid transition temperatures. For example, agar melts at 85 Â°C (185 Â°F) and solidifies from 31 Â°C to 40 Â°C (89.6 Â°F to 104 Â°F); this process is known as hysteresis.