Step aside my boys, I got this.
Imagine a wedge shape on a table. If you push straight down on it, it moves left. Your finger keeps sliding downward and the wedge gets “squeezed out” between the force of your finger and the table.
If you push down at an angle from the right, it also moves left. But if you push down at a slight angle from the left… wait… *it still moves left?* How? That’s because your finger is still sliding down the slope of the wedge, and its slight force toward the table is still squeezing the wedge out to the left.
The wind is your finger, the sail is the slope of the wedge, and the keel on the ocean is the table. With a shallow enough wedge shape, you could sail into the wind at a pretty steep angle.
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