This is one of the most commonly asked questions, people want to know whether the white hairs (fuzzy stuff) are mold or a natural part of the growing process.
If you followed the growing instructions, the white hairs are probably harmless Cilia Hairs which are produced by the sprout when it needs water, they are located on the sprout root. If you have a magnifying glass handy you may actually see tiny water droplets on the hairs. Cilia hairs don't smell, are not slimy and disappear when you water the sprouts. It is not necessary to throw the sprouts away.
Mold is usually seen at the base of the sprout or on the soil. It smells, has a slimy texture and does not disappear when you add water to the sprouts. If the sprouts are moldy, throw them out and start a new batch.
For more information on how to prevent Cilia hairs and avoid mold, check out Sprout Lady Rita's video on Youtube. Click here to watch the video, It's less than 2 minutes long and has cool jazz background music!