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He fell twice, had to apply eye drops after being bothered by swelling under his right eye and resorted to using sawdust to help him grip his racquet in the humidity.

A genetic mutation is like accidentally replacing one ingredient with something completely different -- for example, using sawdust instead of flour.

When our waitress brought it to our table, my first thought was, It really does look like sawdust, and though I had been told, it was still a shock.

The company grinds the plastic film into pellets, then mixes it with sawdust to create composite boards.

But it told Panorama that 77% of the material for its Canadian wood pellets came from sawdust and sawmill residues, with the rest coming from forestry residues and low-grade logs.