How Do They... ? How Do They Knit a Chain-Link Fence? is one of a series of short and snappy videos that reveal the mysteries behind how everyday things happen. Each of these fascinating little videos is without words. Ideal for teachers, How Do They... ? works across the curriculum. And the vieos answer questions kids often ask! How Do They... ? How Do They Knit a Chain-Link Fence? is a fascinating visual voyage, revealing what lies behind the fences many children see around their schoolyards every day.