As he filled his plate, the cautious grin disappeared into the deep furrows of a beaming smile.

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The man on the couch furrows his brow, trying to follow it all.

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We see it every day and we witness it getting worse in our rivers too, where rich furrows of algae now bloom beneath the water.

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During the formation of penitentes, the furrows deepen such that they are sufficiently sheltered from the wind for melting to occur - which helps further deepen the depressions.

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Frogs hid in the furrows left by their tyres.

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They were found by a dermatologist who had noticed that some of his patients after getting Botox injections in their frown lines in the forehead furrows came in and said they were feeling better.

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"For example, even on a road surface with minor ridges or furrows, the driver no longer has to grip the steering wheel tightly and make detailed adjustments, so travelling on the intended path becomes easier, " it said in a statement.

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The results suggest that these emotions are handled in the medial prefrontal cortex (the middle of the front of the frontal lobe), the left posterior superior temporal sulcus (one of the furrows towards the side of the brain) and the visual cortex (towards the back of the brain).

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