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Then he cut long blades of tough crab grass, and sat cross-legged on the ground tearing the grass lengthwise so that each blade became many strands.

After filling the flats, he uses his finger or a piece of wood to make four or five parallel furrows lengthwise across the surface.

When cut lengthwise, the two carrot halves curl because the difference in stress becomes unbalanced.

To find out why they do this, scientists chopped carrots lengthwise to expose their insides, which helped them collect data on how the inner core of the carrot would be affected by refrigeration.

Mammoth tusks are well-suited to isotopic study because they grew throughout the ancient animals' lives, with clearly visible layers appearing when split lengthwise.