Dear friends, the attached link contains an awful story. Proceed with care.
Today I learned something new: The cassava root, from which we get tapioca, contains cyanogenic glucosides. If the root is eaten raw, the human digestive system will convert part of it into cyanide. For this reason, it is critical that cassava be peeled and thoroughly cooked before use.
How I wish I had learned this another way than the way that I did.